RU2214685C2 - Dynamic allocation of frequency band for transmission with use of wireless communication protocol in code-division multiple access radio communication system - Google Patents

Abstract

FIELD: radio engineering, method of signal transmission in CDMA system. SUBSTANCE: algorithm of dynamic allocation of frequency band operates on limits computed on the basis of available ports falling at each subscriber, on anticipated user's frequency band and on parallel user's frequency band compared with carrying capacity. There is also provided priority servicing, unbalanced usage of forward and backward spectra, priority for sending speech messages and commutation of frequency bands. EFFECT: raised efficiency of control over formation and elimination of channels. 7 dwg

Description

 The increasing use of wireless telephony and personal computers by the bulk of the population leads to a corresponding demand for additional telecommunication services, which were originally intended for use only in specialized fields of application.

 So, in the late 80s, wireless business communications, for example, existing cellular communications, were used exclusively by businessmen due to the expected high monthly fee. The same was true for access to remote computer networks, as a result of which, until very recently, only businessmen and large institutions could afford the necessary computer equipment and equipment for access to wired communication lines.

 However, the bulk of the population increasingly wants not only to have access to networks, for example, to the Internet and private networks, but also to have access to these networks also via wireless connection. This is especially true for users of laptops, laptops, handheld digital assistants, etc. All these users would prefer to have access to such networks without having to be tied to a telephone line.

 There is still no widespread satisfactory solution offering low-cost, high-speed access to the Internet and other networks using existing wireless networks. This situation is most likely the result of several adverse circumstances. For example, the usual way to provide high-speed data transfer in a business via hard-wired communication lines can be adapted for voice communication in most homes or offices. In addition, such standard high speed data services are not well suited for efficient transmission using standard wireless cellular devices.

 Moreover, the existing cellular network was originally designed only for voice messaging. Currently used wireless modulation schemes continue to focus on the transmission of voice information, while the everywhere available maximum data rate is about 9.6 kb / s. This is due to the fact that the cellular telephone network in most countries, including the United States, uses analog voice channels having a frequency band from 300 to 3600 Hz. Such a low-frequency channel cannot provide direct data transfer at speeds of 28.8 kb / s or even 56.6 kb / s, which are currently available everywhere, using inexpensive modems for wired communication lines, the data transfer rates of which are currently considered minimum acceptable speeds when accessing the Internet.

 Switching networks with higher-speed blocks are only just beginning to be used in the United States. Although certain wired communication lines, called Integrated Services Digital Networks (ISDN), capable of transmitting data at higher speeds, have been known for several years, their cost has only recently been reduced to a level that can be attractive to a home consumer, even for wired communication lines. Although such networks were known at the time when cellular systems were being created, for the majority of cellular network structures, the provision of ISDN network level data services is not provided.

 European patent application EP 0719062 A2 describes a network system and architecture for dynamically allocating a frequency band or channel. In this system, the allocation of frequency bands is dynamically adjusted according to the selected service levels. For example, a basic telephone service, a wireless ISDN service, a wireless data service, a wireless multimedia service and other types of service, for example, wireless video transmission, are supported in the system by allocating the appropriate number of channels to support each such service on demand.

SUMMARY OF THE INVENTION
The problem to which the present invention is directed, is to provide high-speed transmission of data and voice messages through standard wireless communication channels. According to the invention, this problem is solved by efficiently utilizing the capabilities of the unique combination of protocols and existing cellular signaling, which is available using modulated systems such as code division multiple access (CDMA) systems. More specifically, a method is provided for providing wireless digital signal transmission in wireless communication between a plurality of subscriber units and a base station, the digital signals being transmitted using at least one radio frequency channel via radio signals modulated by a code division multiple access (CDMA) standard and having nominal data rate. The method according to the invention is characterized in that it further includes the following operations:
a) the formation of an accessible set of subchannels within each CDMA radio channel, and the data transfer rate of each subchannel is much lower than the mentioned nominal data rate of the modulated radio signals;
b) establishing a network layer communication session through the base station between the terminal equipment connected to the subscriber module and other terminal equipment connected to the base station; and
c) selection during the network layer session of available subchannels only on the basis of real need, with a change in the number of allocated subchannels in the process of this session.

 Preferably, operation b) includes initially allocating one subchannel when establishing a network layer session and allocating additional subchannels as soon as an additional frequency band is needed during the session to support the transmission of digital signals.

 A plurality of subchannels are preferably isolated on a single radio frequency carrier. In this case, the operation (a) of forming an accessible set of subchannels within each CDMA radio channel further includes assigning a plurality of orthogonal codes to each CDMA channel to provide thus a plurality of subchannels, with each subchannel supporting a data rate much lower than the data rate supported by the CDMA channel itself .

 The digital signals used in the implementation of the method according to the invention have different nominal frequency bands. These signals may include a digitized representation of the voice signal, and in one of its variants, the method further includes the operation of maintaining the allocation of subchannels sufficient to serve the frequency band required for the voice signal during the communication session. Alternatively, the method further includes the step of selecting a sub-channel bandwidth sufficient for continuous transmission of the voice signal.

In a preferred embodiment of the invention, operation c) further includes releasing the subchannels when there are no digital signals during the communication session, while maintaining the communication session at the network level and while spoofing the lower physical layer at the subscriber module to ensure operation similar to that if there were Adequate frequency band is available for continuous transmission of digital signals. It is proposed to allocate subchannels based on the maintenance of a number of subscriber modules in accordance with their priority classes. Appropriate subchannel allocation algorithms can be used to offer different levels of priority service for specific subscribers. They can be allocated based on the available ports for each subscriber, the expected frequency band occupied by the subscriber, the level of increased service charge, etc. It is also desirable that the method of the present invention additionally includes the following operations:
d) buffering data received from the communication session with the terminal equipment until the minimum number of data elements requiring transmission is reached;
e) a request to allocate at least one subchannel for a communication session with terminal equipment,
f) data transmission using dedicated subchannels;
g) a request for the allocation of additional subchannels for communication from a terminal equipment session if the number of buffered data elements exceeds a predetermined maximum threshold value; and
h) release of subchannels from allocation for a communication session with terminal equipment in the event that the number of elements of buffered data falls below a predetermined minimum threshold value.

 Thus, in accordance with one aspect of the invention, some parts of an existing frequency band are initially allocated to establish a communication session. As soon as communication is established, if the subscriber module does not contain any data for transmission, namely, if the data transmission channels remain inactive for a certain period of time, then the previously allocated frequency band is freed. In addition, it is desirable that not all the previously allocated frequency band is freed, but it is preferable that at least some of it remains available for use by a connected subscriber. If the idle state continues for a longer period of time, then even the rest of the frequency band can be freed from the communication session. The session logical connection at the network protocol level is still maintained, even if no subchannels are allocated.

 The method proposed according to the present invention achieves high data rates due to more efficient allocation of access to wireless CDMA channels. In particular, the number of subchannels within the standard CDMA channel bandwidth is determined, for example, by assigning different codes to each subchannel. Instantaneous bandwidth requires that each connected subscriber module is serviced by a dynamically allocated set of subchannels of the carrier radio frequency as a necessary base for each communication session. For example, many subchannels are allocated during periods when the bandwidth requirements on the subscriber side are relatively high, for example, when loading Web pages, and are released when the load on the line is relatively low, for example, when the subscriber reads a web page downloaded earlier, or performs other tasks.

 In a preferred embodiment, a single subchannel is stored for a given minimum idle time for each network layer connection. This contributes to a more effective management of the creation and liquidation of the channel.

List of drawings
The above and other objects, distinguishing features and advantages of the invention will be more apparent from the following detailed description of preferred embodiments of the invention shown in the drawings, with the same reference numbers in different drawings referring to the same elements. In the attached drawings:
FIG. 1 is a block diagram of a wireless communication system using a frequency allocation control circuit according to the present invention;
FIG. 2 depicts a layered protocol scheme such as Open Systems Interconnection (OSI), where a bandwidth allocation control scheme is used within data transfer protocols;
FIG. 3 is a diagram showing how subchannels are allocated within a given radio frequency channel;
figure 4 depicts a more detailed block diagram of the elements of the subscriber module;
FIG. 5 is a state diagram of operations performed by a subscriber module for dynamically requesting release of subchannels;
FIG. 6 depicts a block diagram of a portion of a base station needed to service each subscriber module;
FIG. 7 depicts a high-level structured description of a process performed by a base station for dynamically controlling a frequency band in accordance with the invention.

Information confirming the possibility of carrying out the invention
In FIG. 1 is a block diagram of a system 100 for operating a high-speed data and voice messaging service over a wireless network by seamlessly integrating digital data processing protocols, for example, ISDN networks with digital modulated services, in particular a code division multiple access (CDMA) system system).

 System 100 comprises components of two different types, subscriber modules 101, 102 and base station 170. These components of both types, 101 and 170, interact to provide the functions necessary to achieve the desired effect in accordance with the method proposed in the invention. Subscriber module 101 provides wireless data transmission to portable computing device 110, for example, to a laptop computer, laptop computer, personal digital assistant, and the like. The base station 170 interacts with the subscriber module 101 to provide data transfer between the portable computing device 110 and other devices, such as those connected to the Public Switched Telephone Network 180.

 More specifically, the operation of data and / or voice messaging services is also provided by the subscriber module 101 to the laptop computer 110, as well as to one or more devices, for example, telephones 112-1, 112-2 (collectively referred to as telephones 112) (telephones 112 themselves can in turn be connected to other modems and computers that are not shown in FIG. 1). In the usual ISDN terminology, laptop computer 110 and telephones 112 are referred to as terminal equipment (TE). The subscriber module 101 provides the functions designated as network termination of the first type (NT-1) The illustrated subscriber module 101 is primarily designed to operate with the so-called data transmission interface with a nominal speed (BRI) of the ISDN connection type, which provides two unidirectional channel or "B" channel and a single data channel or "D" channel, which is usually referred to as 2B + D.

 The subscriber module 101 itself contains an ISDN modem 120, a device called a protocol converter 130 in the present description and performing various functions provided by the invention, including spoofing 132 (simulating connections) and bandwidth control 134, a CDMA transceiver 140, and an antenna 150 subscriber module. The various components of the subscriber module 101 may be implemented as separate devices or as a common module. For example, an existing conventional ISDN modem 120, available from many manufacturers, can be used with existing CDMA transceivers 140. In this case, unique functions are provided entirely by protocol converter 130, which can be sold as a separate device. Alternatively, the ISDN modem 120, the protocol converter 130, and the CDMA transceiver 140 may be combined as a complete module and sold as a separate subscriber module device 101.

 ISDN modem 120 converts data and voice messages between terminal equipment 110 and 112 into the format required by the standard "U" interface of ISDN networks. The U interface is a reference point in ISDN systems that defines the connection point between a network (NT) terminal and a telephone company.

 Protocol converter 130 performs spoofing 132 and basic bandwidth management functions 134, which are described in more detail below. In general, spoofing 132 provides a guarantee that the subscriber module 101 simulates the connection of the terminal equipment 110, 112 with the public switched telephone network 180 on the other side of the base station 170 at all times.

 The bandwidth management function 134 responds to the allocation and release on demand of the CDMA radio channels 160. The bandwidth management also includes dynamically controlling the bandwidth allocated to the session by dynamically assigning portions of the CDMA channels 160 in a manner described in more detail below.

 The CDMA transceiver 140 receives data from the protocol converter 130 and reformatts this data into an appropriate form for transmission through the antenna 150 of the subscriber module via the CDMA radio channel 160-1. The CDMA transceiver 140 may operate on only one 1.25 MHz radio frequency channel, or, alternatively, in a preferred embodiment, may be tuned to a plurality of allocated radio channels.

 CDMA signals are then received at the base station and processed by the base station equipment 170. Base station equipment 170 typically comprises a multi-channel antenna 171, a plurality of CDMA transceivers 172, and bandwidth management functionality 174. Bandwidth controls control the allocation of CDMA radio channels 160 and subchannels. The base station 170 then provides demodulated radio signals to the public switched telephone network 180 in a manner known to those skilled in the art. For example, base station 170 may be connected to the public switched telephone network 180 through a number of different effective communication protocols, for example, an ISDN base rate transmission protocol or other D-channel access protocols, for example, IS-634 or V5.2.

 It should also be noted that the signals corresponding to data transmission are transmitted in both directions via CDMA radio channels 160, i.e., data signals sent from laptop computer 110 are transmitted to public switched telephone network 180, and data signals received from a public switched telephone network 180 are transmitted to a laptop computer 110.

 Other types of subscriber modules, for example, module 102, can be used to operate data services at a higher speed. Such subscriber modules 102 typically provide a service, referred to as an nB + D type service, that can use a so-called base rate interface type protocol for communication with terminal equipment 110, 112. These modules provide higher speed data communications, for example 512 kb / s via the U-interface. The operation of the protocol converter 130 and the CDMA transceiver 140 for the subscriber module 102 of the nB + D type is similar to the operation of the subscriber module 101 described above, given that the number of radio channels 160 to support the subscriber module 102 is larger or each radio channel has a wider frequency band .

 As shown in FIG. 2, the present invention can be described in the context of a layered Open Systems Interaction Protocol scheme. Three protocol stacks 220, 230, and 240 are for ISDN modem 120, protocol converter 130, and base station 170, respectively.

 The protocol stack 220 used by ISDN modem 120 is common for ISDN communication and includes, on the terminal side, analog-to-digital conversion (and digital-to-analog conversion) 221 and formatting 222 digital data at level one, as well as application level 223 at level two. On the U-interface side, the protocol functions include a Data Rate Interface with a Nominal Rate, for example, in accordance with standard 1430 at level one, a D-channel access protocol stack at level two, for example, defined by Q. 921 standard, and higher-level network protocols level, for example, Q.931 or X.227 and high-level end-to-end signaling 228 required to establish network layer sessions between modes.

 The lower layers of the protocol stack 220 combine two unidirectional (B) channels to achieve 128 kB / s one-way data transfer rates in a manner well known to those skilled in the art. Similar functionality may be provided at a base rate transmission interface, such as that used by the subscriber module 102, for connecting multiple B channels to achieve data rates of up to 512 kb / s via the U interface.

 The protocol stack 230 associated with the protocol converter 130 comprises a data interface 231 with a nominal speed of one, and an interface 232 of the D-channel access protocol of level two on the U-interface, to bring ISDN stack 220 into line with the corresponding levels modem.

 At the next, higher level, commonly referred to as the network layer, the bandwidth management functionality 235 covers both the U-interface side and the CDMA radio channel side of the protocol converter stack 230. On the CDMA radio channel side 160, the protocol depends on the type of CDMA radio communication used. An effective wireless transmission protocol, referred to herein as EW [x] 234, includes layer one 231 and layer two 232 ISDN protocol stacks so that terminal equipment 110 can be disconnected from one or more CDMA radio channels without interrupting a network session higher level protocol.

 Base station 170 comprises suitable CDMA 241 and EW [x] 242 protocols, as well as bandwidth management tools 243. On the public switched telephone network 180 side, the protocols can convert back to the nominal speed transmission interface 244 and the D-channel access protocol interface 245, or they can also contain higher level network protocols such as Q.931 or V5.2 246.

 Functionality 247 call processing allows the network layer to form and delete channels and provide other processing required to support a session of end-to-end connections between nodes, as is well known to specialists in this field of technology.

 The spoofing function 132, implemented by the 234 EW [x] protocol, includes the necessary functions for properly maintaining the U-interface for the ISDN connection, even if there is no CDMA radio channel 160. This is necessary because ISDN, being the protocol originally developed for wired connections , expects to send a continuous stream of synchronous data bits, regardless of whether there is actually data to transmit at each end of the terminal equipment. Without spoofing function 132, an entire end-to-end network layer session would require radio channels 160 of sufficient bandwidth to support a data rate of at least 192 kB / s, regardless of the actual availability of data.

 Protocol 234 EW [x], therefore, assumes that a CDMA transceiver 140 verifies that these synchronous data bits are transmitted over the ISDN communication channel to simulate the connections of terminal equipment 110, 112, based on the assumption that a wireless communication channel is continuously available 160 sufficient bandwidth. However, the frequency band is allocated only when there is actual data for transmission from the terminal equipment to the wireless transceiver 140. Thus, unlike the known solutions, the network layer does not need to allocate the assigned frequency band for the entire communication session. That is, when there is no data on the terminal equipment to transmit to the network equipment, the bandwidth management function 235 frees up the originally assigned frequency band 160 of the radio channel and makes it available to another transceiver and another subscriber module 101.

 In order to better understand how the frequency band control systems 235 and 243 dynamically allocate the frequency band of the radio channel, refer to FIG. 3. Figure 3 shows one possible frequency plan for wireless channels 160 in accordance with the method proposed in the present invention. More specifically, a typical transceiver 170 may be tuned to any 1.25 MHz channel within a much wider frequency band, for example, up to 30 MHz. If located in existing frequency bands of cellular radio channels, these bands usually exist in the range from 800 to 900 MHz. For personal communication systems such as wireless systems, the frequency band is usually allocated in the range from 1.8 to 2.0 GHz. In addition, two matched frequency bands are usually active at the same time, separated by a guard band, for example, 80 MHz, the two matched bands form a full duplex transmission channel in the forward and reverse directions.

 Each of the CDMA transceivers, for example, the transceiver 140 in the subscriber module 101 and the transceiver 172 in the base station 170, can be tuned at any given point in time to a given radio channel 1.25 MHz. In a general sense, it is obvious that such a 1.25 MHz radio frequency carrier provides, at best, the full equivalent of a maximum transfer rate of about 500-600 kbytes / s within acceptable limits on the probability of errors.

 When using well-known solutions, it was usually assumed that in order to support communication such as ISDN, which can contain information at a speed of 128 kB / s, at best, only about 3 ISDN subscriber modules (500/128 kB / s) can be supported.

 In contrast to the known solutions, in the present invention, the available frequency band of about 500-600 kbytes / s is divided into a relatively large number of subchannels. In the described example, the band is divided into 64 subchannels 300, each of which provides a data transfer rate of 8 kB / s. This subchannel 300 is physically implemented by transmit coding with one of a number of different assignable pseudo-random codes. For example, 64 subchannels 300 may be determined within a single CDMA radio frequency carrier using different orthogonal Walsh codes for each particular subchannel 300.

 The main idea underlying the invention is the allocation of subchannels 300 only if necessary. For example, a plurality of subchannels 300 are allocated for some time when a particular ISDN subscriber unit 101 requests transmission of a large amount of data. These subchannels 300 are released at a point in time when the subscriber module 101 is relatively lightly loaded.

 Before describing the preferred allocation and deallocation of subchannels, for better understanding, the subscriber module 101 will be described in more detail. As shown in FIG. 4, the converter protocol 130 includes a processor controller 410, a reverse channel processing unit 420, and a forward processing unit 430 channel. The reverse channel processing unit 420 includes a reverse ISDN spoofer 422, a voice message and data detector 423, a voice message decoder 424, a data processing unit 426, and a channel multiplexer 428. The forward channel processing unit 430 contains analog functions operating in the reverse direction, including a channel multiplexer 438, a voice message and data detector 433, a voice message decoder 434, a data processing unit 436, and a direct ISDN spoofer 432.

 In operation, the reverse channel processing unit 420 first receives channel data from the ISDN modem 120 via the U-interface and directs them to the reverse ISDN spoofer 432. Any repeated, duplicate "echo" bits are deleted from the received data and, after data is extracted, they are routed to the direct ISDN spoofer 432. The remaining bits of levels three and higher are thus the information that is needed for transmission over a wireless channel.

 This extracted data is sent to the voice message decoder 424 or to the data processing unit 426, depending on the type of data being processed.

 Any D-channel data from the ISDN modem is sent directly to the voice message and data detector 423 for insertion at the inputs of the D-channel to the channel multiplexer 428. The voice message and data detector 423 determines the content of the D-channels by analyzing the commands received in the D-channel.

 D-channel commands may also be interpreted to control the class of wireless services provided. For example, the controller 410 may store a client parameter table containing information about clients of a desired class of service, which may contain parameters, for example, maximum data rate, etc. Corresponding instructions are thus sent to channel multiplexer 428 to request one or more of the required subchannels 300 via radio channels 160 for communication. Then, depending on whether the information is voice messages or data, the voice message decoder 424 or the data processing unit 426 begins to deliver information to the channel multiplexer 428.

 Channel multiplexer 428 may further utilize control signals provided by voice and data detector 423, depending on whether the information is voice messages or data.

 In addition, the processor controller 410, working in conjunction with the channel multiplexer 428, facilitates the necessary implementation of the 234 EW [x] protocol between the subscriber unit 101 and the base station 170. For example, sub-channel request commands, initial channel settings, and channel deletion are sent via commands placed on the wireless control channel 440. These commands are intercepted by equivalent functionalities at base station 170 to ensure proper allocation of subchannels 300 for a particular network layer session.

 The data processing unit 426 provides an estimate of the data rate required by the processor controller 410, so that appropriate commands can be sent on the control channel 440 to allocate the appropriate number of subchannels. The data processing unit 426 may also perform packet assembly and buffering layer three data in an appropriate format for transmission.

 The forward channel processing unit 430 operates in a similar manner. More specifically, signals are first obtained from channels 160 by channel multiplexer 438. In response to receiving information in the control channels 440, control information is sent to the voice message and data detection detector 433. If it is found that the received information contains data, the received bits are sent to block 436 data processing. Alternatively, the information is speech and is sent to a voice message decoder 434.

 Voice messages and data are then sent to the direct ISDN spoofer 432 for conversion to the proper format of the ISDN protocol. This information packet is coordinated with receiving echo bits from the reverse ISDN spoofer 422 to support proper expected synchronization on the U interface with the ISDN modem 120.

 It can now be understood how a network layer communication session can be saved, even though the wireless frequency band originally allocated for transmission, in the absence of information for transmission, is re-allocated for other uses. More specifically, reverse 422 and direct 432 spoofers cooperate to loop back non-information carrier signals, for example, flag configurations, synchronization bits, and other necessary information, so as to simulate a data terminal equipment connection connected to ISDN modem 120 for continue operation, as if the dedicated wireless channel through the CDMA transceiver 150 was constantly available.

 Thus, if there is no actual need for transmitting information from terminal equipment represented by channel multiplexers 428, or if actual information is obtained from channel multiplexers 438, a communication system made according to the invention can free the originally assigned subchannel 300, making it thus available to another subscriber module 101 of the wireless communication system 100.

 The processor controller 410 may also perform additional functions to execute the 234 EW [x] protocol, including error correction, packet buffering, and error probability measurement.

 The functions necessary for controlling the 235 frequency band in the subscriber module 101 are performed in connection with the EW [x] protocol, usually by means of a processor controller 410, working in conjunction with channel multiplexers 428, 438, and data processing units 420, 436. In general, bandwidth assignments are made for each network layer session based on the measured short-term required data rate. One or more subchannels are then assigned based on these measurements and other parameters, for example, the amount of data in the queue, or the priority of the service, as set by the provider of this service. In addition, when a given session is idle, the end-to-end connection is preferably maintained with at least a minimum number of subchannels, for example, with one assigned subchannel. Moreover, this single subchannel can ultimately be released after a set minimum downtime.

 In FIG. 5 shows in detail the process proposed in accordance with the invention, by which the subscriber module 101 may request the allocation of subchannels 300 from the base station 170. In the first state 502, the process is in an idle (idle) state. At a certain point, the readiness of the data for transmission is reached and state 504 occurs, where the fact that the data is ready for transmission can be detected using any input data buffer in the data processing unit 426, indicating that there is ready data.

 In state 504, a request is made, for example, through control channel 440 to allocate a subchannel to subscriber module 101. If the subchannel cannot be provided immediately, then a wait state 506 may occur in which the subscriber module simply waits and queues its request for allocation of the subchannel.

 Ultimately, the subchannel 300 is allocated by the base station, and the process transitions to state 508. In this state, data transmission using the single assigned subchannel may begin. The process will continue in this state until sub-channel 300 is sufficient to support the required data rate and / or while it is in use. However, if the input buffer becomes empty, for example, if a corresponding command is received from the data processing unit 426, the process will continue in state 510. In this state 510, the subchannel will remain assigned if data transmission is resumed. In this case, for example, when the input buffer becomes full again and the data is ready for transmission again, the process returns to state 508. If the low-traffic timer expires, the process changes from state 510 to state 512, in which a single subchannel 300 is freed. The process then returns to the idle state 502. In state 512, if the queue request is in the idle state from states 506 or 516, instead of freeing the subchannel, it is used to satisfy such a request.

 Returning to state 508, if in the described situation the contents of the input buffer begins to fill up to a value that exceeds a predetermined threshold, indicating that a single subchannel 300 will not be enough to support the necessary data stream, the process goes to state 514, in which more subchannels 300 are required. Message a request for subchannels is again sent via control channel 440 or through an already allocated subchannel 300. If additional channels are not immediately available, then the waiting state 516 occurs and the request m It can be repeated by returning to state 514 and 516 on demand. Ultimately, additional subchannels will be allocated, and the process may return to state 508.

 If there are additional subchannels, processing continues at state 518, where data can be transmitted on multiple N subchannels. This can be done at the same time through the channel connection function or another mechanism for allocating incoming data between N subchannels. As soon as the contents of the input buffer decrease below the void threshold, a wait state 520 occurs.

 If, however, the buffer fill rate is exceeded, state 514 may occur in which a larger number of subchannels are again required.

 In state 520, if the time on the high traffic timer expires, then one or more additional channels are released in state 522 and the process returns to state 508.

 FIG. 6 shows a block diagram of the components of the equipment 170 of the base station of the system 100. These components perform functions similar to those already described in detail with respect to FIG. 4 for the subscriber module 101. It should be understood that for each subscriber module 101 or 102, a forward channel 620 and a reverse channel 630, which must be supported by base station 170, are required.

 The forward channel 620 of the base station functions similarly to the reverse channel 420 of the subscriber unit 100, including an inverse subchannel multiplexer 622, a voice or data detection unit 623, a voice message decoder 624, a data processing unit 626, and an ISDN spoofer 622, keeping in mind that the data flows in the opposite direction at the base station 170. Similarly, the reverse channel 630 of the transmission to the base station contains components similar to those contained in the direct channel 430 of transmission m towards the subscriber module, including ISDN-spoofer 632, block 633 detection of voice or data messages, voice decoder 634, data processing unit 636, and subchannel multiplexer 638. Base station 170 also requires a processor controller 610.

 One difference between the operation of the base station 170 and the subscriber module 101 is the implementation of the functions 243 management bandwidth. This may be done in processor controller 610 or in another process in base station 170.

 A description of the operation of the high-level software performed using the block 650 dynamic allocation of the control channel 243 frequency band is contained in Fig.7. This process includes a continuously executing head program (head program module) 710, processing a port request, processing a frequency band free and processing a frequency band request, and then detecting and deleting unused channels.

 Port request processing is described in more detail in code module 720. It includes receiving a port request and reserving a subchannel for a new connection, preferably selected from the least used part of the radio frequency band. Once the reservation is made, the channel radio frequency and code assignment are returned to the subscriber module 101 and the subchannel allocation table is updated. Otherwise, if there are no subchannels, then the port request is added to the request queue for the port. The estimated wait time can be estimated by the number of pending port requests and priorities, and a corresponding wait message can be sent to the requesting subscriber module 101.

 In the frequency band freeing unit 730, the channel linking function performed in the multiplexer 622 on the forward channel indicates the need for freeing the subchannel. The frequency and code are then returned to the pool of available subchannels, and the channel table is updated.

 The next bandwidth request module 740 may include selecting a request having the highest priority at the lowest bandwidth usage. The list of available subchannels is then analyzed to determine the subband with the largest number of channels available. Finally, subchannels are assigned based on need, priority, and availability. The channel bandwidth binding function receives a notification from channel multiplexer 622 and a channel table storing data about which subchannels are assigned to which connections is updated.

 In typical on-demand bandwidth allocation, probability theory can be used in typical situations to control the number of connections or available ports and the spectrum needed to maintain the expected throughput and frequency of the assigned subchannels. Priority service may also be provided to subscribers who have additionally paid for such service.

 It should be noted that, for example, in case of supporting ISDN subscriber module 101 with a speed of 128 kb / s, more than 16 • 8 kb / s of subchannels can be allocated at a given time. In particular, the allocation of a larger number, for example, 20 subchannels, may also be allowed to compensate for the wait and reaction when assigning subchannels. It also allows you to handle peak data streams in a more efficient way, for example, as is usually done when loading Web pages.

 In addition, voice traffic may take precedence over data traffic. For example, if a voice call is detected, at least one subchannel 300 may be active at all times and dedicated exclusively to transmit voice messages. Thus, the likelihood of blocking voice calls will be minimized.

 Although the present invention has been described with reference to preferred embodiments, it will be apparent to those skilled in the art that various changes can be made to the form and details without departing from the spirit and scope of the invention as defined in the appended claims.

 For example, instead of ISDN, another digital wire communication protocol may be included in ЕW [x] protocol, for example, xDSL, Ethernet and Х.25, which due to this can use the described scheme of dynamic assignment of subchannels.

 For specialists in this field of technology it is obvious that there may be many equivalents of the presented specific embodiments of the invention. Such equivalents should also be included within the scope of the claims.

Claims (10)

 1. A method for providing wireless digital signal transmission in wireless communication between a plurality of subscriber modules and a base station, the digital signals being transmitted using at least one radio frequency channel via radio signals modulated by the Code Division Multiple Access (CDMA) standard and having a nominal speed data transmission, characterized in that it further includes the following operations: a) the formation of an accessible set of subchannels within each CDMA p diokanala, wherein the transmission data rate of each subchannel is much less than said nominal data transmission rate modulated radio signals; b) establishing a network layer communication session through the base station between the terminal equipment connected to the subscriber module and other terminal equipment connected to the base station; and c) highlighting during the session the network layer of available, available subchannels only on the basis of real need, with a change in the number of allocated subchannels in the process of this session.  2. The method according to claim 1, characterized in that the available multiple subchannels are formed on one radio frequency carrier by assigning orthogonal codes for each subchannel.  3. The method according to claim 1, characterized in that the operation b) includes: i) initial allocation of one subchannel when establishing a network layer session; and ii) the allocation of additional subchannels as soon as during the session an additional frequency band is required to support the transmission of digital signals.  4. The method according to p. 1, characterized in that the digital signals contain a digitized representation of the voice signal, and the method further includes the operation of maintaining the allocation of subchannels sufficient to serve the frequency band required for the voice signal during the communication session.  5. The method according to claim 1, characterized in that the digital signals comprise a digitized representation of the voice signal, and the method further includes the step of selecting a subchannel frequency band sufficient to continuously transmit the voice signal.  6. The method according to claim 1, characterized in that step c) further includes releasing the subchannels when there are no digital signals during the communication session, while maintaining the communication session at the network level and while spoofing the lower physical level at the subscriber level to ensure functioning in the same way as if there was a sufficient frequency band available for the continuous transmission of digital signals.  7. The method according to claim 1, characterized in that the subchannels are allocated based on the maintenance of a number of subscriber modules in accordance with their priority classes.  8. The method according to claim 1, characterized in that the digital signals have different nominal frequency bands.  9. The method according to p. 1, characterized in that the operation a) forming an accessible set of subchannels within each CDMA radio channel further includes assigning a plurality of orthogonal codes to each CDMA radio channel in order to provide thus a plurality of subchannels, each subchannel supporting a data transfer rate significantly lower, than the data rate supported by the CDMA channel itself.  10. The method according to claim 1, characterized in that it further includes the steps of: d) buffering the data received from the communication session with the terminal equipment to achieve the minimum number of data elements requiring transmission; e) a request to allocate at least one subchannel for a communication session with terminal equipment; f) data transmission using dedicated subchannels; g) a request for the allocation of additional subchannels for communication from a terminal equipment session if the number of buffered data elements exceeds a predetermined maximum threshold value; and h) releasing subchannels from the allocation for a communication session with terminal equipment in the event that the number of buffered data elements falls below a predetermined minimum threshold value.

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