MXPA98004488A - Reg protocol for isdn wireless transmission using - Google Patents

Abstract

A network protocol for wireless points (base station) to multipoint (user) networks where users are stationary which use time division multiplexing in the address of the base station to the user, hereinafter, the address downstream, and the time division multiple access in the user's address to the base station, hereinafter referred to as the upstream address. The time slots in the upstream and downstream directions carry ATM cells. The users maintain the synchronization of the time slots within + -2 modulation symbols by monitoring the downstream receptions (11) and the central processing unit tracks the allocation of time slots and handles the signals in band. while segmentation and reassembly is carried out (6) it handles A cell treatment

Description

NETWORK PROTOCOL FOR ISDN WIRELESS TRANSMISSION USING ATM Background The recent arrangement of FCC frequencies to 2. 5 GHz and 28 GHz has enabled the release of transmission ISDN services for residential and commercial users through wireless means. ISDN Transmission typically uses ATM as the link medium of the network protocol. ATM is a switch oriented protocol link where each user has dedicated a connection to the switch and a connection to the administrator switch bandwidth of the multiple users by queues of input cells until they can be released to the appropriate output . In a wireless point of the ult-L-point system, the analogy of the switch resides in a base station, and the link to the switch is a medium shared by all users who access the medium that must be controlled. Therefore, for a wireless point to multipoint systems there is an additional need for the means of access control that is not required in ordinary ATM networks. The requirements for access control means for wireless points to multipoint systems where users are stationary are only compared to other wireless networks such as local area networks (LANs) as specified by the IEEE 802.11 standards. A wireless point to a multipoint system can take advantage of the stationary nature of users by enabling the use of highly directional antennas at user stations. However, the base station will remain employing broad-beam antennas and so will then have multiple user transmissions received simultaneously. The access control means will be necessary to ensure that the mutual interference by the shock of the multiple user transmission on the base station antenna is eliminated. There are numerous MAC protocols currently in use by both wireline and wireless standards. In ethernet, where wiring is a shared medium, the multiple access carrier bearer is employed, which is essentially listened to before speaking. In LANs, such as those specified by IEEE 802.11 standards, access control means are also administered through multiple access carrier detection. This is possible because the user terminals will typically have each omnidirectional antenna such that each user can receive transmissions from other users and hit when the channel frequency is available. This is not possible with the wireless point to multipoint systems where stationary users use directional antennas, since they can not receive transmissions from other users. An additional complication in the wide area of wireless points to multipoint systems is that a two-way differential range between users close to the base station and those distant from the base station may be much greater than a modulation symbol. The object of this invention is a network protocol that provides bandwidth to users on a demand basis, which controls access by users of the shared wireless medium, in which bandwidth is efficient, and. in which it can be implemented with a minimum hardware cost. DESCRIPTION Summary of the Invention A network protocol for wireless points (base station) to multipoint (user) networks where users are stationary which use time division multiplexing in the direction of the base station to the user, hence in forward the downstream address, and the time division multiple access in the user's address to the base station, hereinafter called upstream address, where the access control means actively assigns time slots in the address upstream to facilitate multiple demands for bandwidth by multiple users, where the upstream timing box is synchronized to the downstream box timing, where the time slots carry individual ATM cells, where the first time slot of the upstream frame carries an ATM start cell frame, where the upstream time slot is maintained within ± 2 modulation symbols across the control timing from the base station to the user, where the random access of time slots is used to control the plane requirements by incoming users to the network and users in standby mode looking for a section to begin, where the survey is used by the administration of plan functions and the responses by the users are in a survey response time slot. Characteristics of the Invention A wireless point network protocol (base station) to multipoint (user) networks with stationary users using high gain directional antennas where: 1. means for convergence transmission layer are provided through: a) the time division multiplexing being used in the direction of the base station to the user, hereinafter referred to as the downstream address; b) the time division multiple access used in the user's address to the base station, hereinafter referred to as the upstream address; c) time slots in the upstream direction having two preamble bytes, one ATM cell, and one band guard byte; d) time slots in the downstream direction that have a synchrony byte, an ATM cell, and no guardband e) uplink frame timing synchronized with the downlink box timing, where the first slot in the box downstream carries an ATM start cell box which is defined by a single reserve VPI / VCI f) frame periods in both upstream and downstream directions approximately but not greater than six milliseconds in length to allow the release of traffic from voice with minimal latency. Means for dependent physical medium layer with: a) the downstream chain in continuous carrier, without pulse-shaped filtering, with frequency channels synchronized with symbols and spaced 1 TD apart where TD is the period of a modulation symbol chain down; b) the burst mode of the upstream chain with 25% excess deep cosine bandwidth filtered deep with frequency channels spaced 1.25 / TU apart where TU is the period of a modulation symbol upstream; c) QPSK modulation or alternatively 16 QAM is used in the upstream and downstream chain; d) A concatenated convolutional code (60, 54) Reed Solomon on GF (256) and a speed of 7/8 is used in chain down; and e) A Reed Solomon code on GF (256) is used in the upstream chain. 3. Means for controlling control plane functions are provided through: a) band signaling through ATM cells with reserved VPI / VCIs such that the requirements for acquisition, demodulation, and error correction towards in front are uniformly through the data, control and administrative blueprints of network protocol, b) middle of convergence layer of access control transmission which actively assigns time slots in upstream direction to facilitate several demands for the width of band of multiple users; c) Continuous time slots at the beginning of the upstream box are used to enter the network by users who tune a range of two paths that have not resolved to avoid mutual interference, where incoming users to the network remain at the entrance of the network. network in time slots until its timing is aligned by the means described in clause 1; d) the section surveys are carried out on a containment basis through random access of the grid entry time slot network a) the carrier control plane recognizes the requisition service in the payload of the table of ATM start cell in downstream frame The means to administer the functions of plaforcionados through: a) signaling in band through ATM cells with reserved VPI / VCIs such that the requirements of acquisition, demodulation and error correction forward are uniformly through data, control and management of plans, network protocol; b) user survey by the base station, to which users respond in dedicated time slots in the chain box above; c) Carrier administration plane required in the payload of the start box of the ATM cell in the string carrier below; d) the upstream time slot synchronization is maintained within + - 2 modulation symbols through the timing control from the base station to the user and through enslaving the user transmit clock symbol to the received clock symbol in the transmission convergence layer; e) upstream power control is employed to ensure the strength of the appropriate received signal at the base station while minimizing interference from the adjacent cell. 5 hardware and software means for implementing the above clauses in the base station including: a) means for routing in-band signaling ATM cells by the ATM switching apparatus for and from the central processing unit; b) means for measuring subscriber timing offsets through count periods of the clock reference symbol from a time master frame for detecting the Barker sequence of the transmission received from the user; c) means for measuring the level of the signal received via error bit rate estimation for the closed mesh power control of the user's transmitter. 6. hardware and software means to implement the above clauses in the user's equipment including: a) means to route ATM signaling in-band cells to and from the ATM switch or unit segmentation and reassembly apparatus central processing of the user's equipment; b) power transmitter setting based on the received power level and power control commands via baseband signaling of ATM cells from the base station; c) means for enslaving the reference clock transmission symbol to the symbol received from the reference clock; d) means for adjusting the transmission symbol clock timing to minimize interference to other users. DESCRIPTION OF THE DRAWINGS The above and other objects, advantages and characteristics of the invention will be more clear when considering the following specifications and references to the drawings where: Figure 1 shows the protocols stored for the invention according to the model convention reference OSI, Figure 2 shows the two ways around the range effect from the base station which causes the need for long guard bands between the user transmissions, 1 being in the vicinity of the remote user, and 2 being the user Distant Figure 3 is a block diagram of the user or the hardware architecture of the subscriber station, and Figure 4 is a block diagram of the hardware architecture of the base station. DETAILED DESCRIPTION OF THE INVENTION It is well known that the asynchronous transfer mode is the candidate network link protocol for comprehensive broadband services of digital networks (B-ISDN) which is typically defined as bit rate in excess of the speed Primary ISDN interface (PRI-ISDN) of 1,544 Mbps. Physical layer standards have been developed for use or have been developed for use over ATM synchronous optical networks (SONET) at speeds of 155 and 622 Mbps, over category 3 twisted pair at 25 Mbps and 100 Mbps and about 5 twisted pair at 45 Mbps and lOOMbps. . In each of these cases, however, the network to-pology is oriented oriented where each user has a dedicated connection to a switch input port, and the input cell of the switch channel can be routed to an output of the switch port. This is a classic star configuration. At a wireless point for multipoint system, where each user employs a narrow beam antenna, and the switch resides in a centrally located base station which employs a wide beam antenna, in which multiple users fall into this beam, the wireless medium becomes a shared medium While the multipoint nature point of the system seems to have a star topology, because the wireless medium is shared, this is currently a channel or ring configuration. Then, a means of access control protocol needs to be defi ned. The network protocol store is as shown in Figure 1, and comprises the physical layer of the OSI reference model. Within the physical layer is the physical layer-dependent medium which involves modulation, correction of forward error, and filtering of the signal that is transmitted over the wireless medium. The convergence layer of the transmission comprises multiple time access, the frame structure, and the time slot structure within each frame. The plane control functions in the transmission convergence layer include all the functions necessary to control access to the wireless medium through the allocation of time slots. This function should interface to a high-level control of plane functions such as the ITU standard signaling Q.2931, the ATM forum user interface network and the LAN emulation clients. The management of the plane functions in the transmission convergence layers involves the control time to minimize the guard band times between the time slots. In the physical layer, function management involves controlling the power of the user's transmitter to ensure an adequate signal level received at the base station but not so strong as to cause adjacent cell interference, where cell refers to a cell in a cellular distribution system, not an ATM cell. Additionally, the manipulation plane functions include the control of the user's transmission frequency in such a way that it does not interfere with users in adjacent frequency channels, which is described in detail in a separate patent application. WAREHOUSE OF NETWORK PROTOCOLS. Transmission Convergence Layer Downstream Because the downstream data originates from the same source and is a continuous carrier, different ATM virtual circuits are multiplexed into time division into a single RF carrier. The format is shown in Table 1. The synchrony byte is used to synchronize the deinterleaver and the Reed-Solomon decoder in the user's demodulator.

Table 1: Structure of Time Slot Chain Abaj or 1 2 3 54 55 56 57 58 59 60 byte ATM check-up check-up check-up check-up synch check-up. Cell B te l byte 2 byte 3 byte 4 byte5 byte 6 3. 4.1.1.2 UP CHAIN Because the upstream data originates from a different source, with different timing symbol and frequency compensation center, the upstream chain will be multiple access in time division. The format is shown in Table 2. The start of the chain down frame is delineated by a start ATM cell box in the first time slot. This startup ATM cell table has a reserved VPI / VCI guide which can be addressed by ASIC segmentation and reassembly to the main processor on the user's equipment. This will reset the counting of the frame time slot in the user's processor, enabling the timing of the frame to be synchronized to the timing of the chain down frame. The payload of the start cell box will contain fields to be resolved.

Table 4 Payload Cell Start Table 1 N N + l M M + l P P + l 48 Containment Subscriber Ids Power settings, freeservation Availability / For question and timing survey Subscriber recognition The upstream frame structure is shown in Table 5. There will be contiguous time slots at the start of the frame by random access by users attempting to either enter the network during a power-up or by users attempting to connect to an active state from an inactive state, or by users who need control signaling during an active state.

Dependent Layer of the Physical Medium Chain Down The modulation parameters are shown in Table 6. Since all the frequency channels in the downstream direction originate from the same source, the downstream chain can be a continuous carrier with each synchronous symbol of frequency channel. To keep the data on each frequency channel being with a synchronous symbol, this enables the frequency channel to be spaced 1 / TD, where TD is the period of a downstream modulation symbol. This obviates the need for spectral filtering on each frequency channel to reduce its spectral occupancy.

Table 6 Chain Modulation Parameters Down Table 7 Data Rate Typical Downstream QPSK Symbol modulation rate 34,000 Mbaud Symbol coding rate 68,000 Msps Convolutional encoded symbol rate 61,200 Msps Bit rate 53,050 Mbps ATM speed 52,558 Mbps ATM cell rate 0.124 M / sec. ATM cell speed per frame 743,000 Frame period 5,994 ms Chain Up The modulation of these parameters is shown in the table Table 8 Chain Modulation Parameters Top Table 9 Upstream Chain Data Rate Typical QPSK Symbol modulation rate 2,607 Mbaud Time slot symbol rate 5,213 Msps Coded symbol rate 4,961 Msps ATM speed 4,456 Mbps ATM cell speed 0.011 Mbps ATM cell rate per frame 63,000 Cells / sec frame period 5,994 ms PLAN OF ADMINISTRATION Network Input Under a power on, the user will acquire the down-link frame timing and starts the processing of the containment availability recognition field of the payload of the start cell frame. When containment time slots are available, a null user ID will be contained in the field. The user will then transmit a single ATM network entry cell over the containment time slot in the next downstream frame. An ATM network entry cell will be defined by a reserved VCI / VPI in the guidance cell, plus additional information in the payload containing the user ID. If the ATM cell entering the network is successively received by the base station, the base station will recognize in response with the user's ID in the box containment field recognition / availability field in the following table. The field also contains time, frequency and power settings. The user will continue to transmit ATM network input cells over the contention time slot until their time, frequency and power are within prescribed limits at which time will be commanded to a time-release state of containment slots by another user In the event of a collision on the contention time slots, the base station will not recognize any user and the start cell box by indicating that contention time slots are available because they contain a null user ID. The users will then perform any number of well-known algorithms, such as return randomly based on the user ID, to determine how many frames they expect before retransmission. Network Administration During the operation, the inactive users will have to be periodically surveyed to ensure that their coordination of time slot, trans-mission frequency and transmission power are convenient to maintain reliable communications. This is necessary because the propagation characteristics will change over time; for example, if it starts to rain. With approximately 250 users per coverage area, choosing one user per box, each user would be chosen every 1.5 seconds. The number of users chosen per table will depend on the user density, coverage area, and data capacity used when the system is distributed.

The sequence of choice is described. In the start cell box, the user Ids are located in the selection field. During the following table, these chosen subscribers respond over the election response time slots. The base station calculates the power, frequency, and time control correction factors and sends them to the subscriber setting field of the frame start cell in the following table.

If the user fails to respond to a survey, the subscriber setting field will be null for that user. The base station will then wait until the next cycle, then it chooses all the other users, before choosing the user again, so that other users are chosen at regular intervals. After a certain number of surveys when the user fails to respond, the network administrator will consider this in a low power state. That user will have executed the entrance to the network to return to the waiting state. CONTROL PLAN. When a user in a waiting state wishes to initiate a session, he or she will transmit an ATM session requisition cell over the containment time slots when they are available. Again, the session requisition ATM cell will have a VPI / VCI in the guide cell with the payload of the cell that contains the requisition type and the user ID. The transmission convergence call processing agent in the base station will then interface with the high-level control plane functions necessary to complete the initialization of the session. Depending on the level of interaction required to initiate the session, the user may only have to send a session requisition cell or the user may have to be assigned to a traffic time slot to complete the signaling functions. IMPLEMENTATIONS OF HARDWARE AND SOFTWARE User Equipment. Figure 3 shows a block diagram for the subscriber equipment which implements the wireless network protocol. An RF transceiver (1) InterfaceA with the antenna and performs signal amplification, down conversion from RF to the baseband, and the gain control levels provides own converter (2) analog / digital (A / D). The digital demodulator (3) recovering the carrier and the symbol time of the input signal and passes a data demodulation transient decision correction decoder advance error (4), the digital demodulator recovers the time symbol of the input signal by the phase control of the sampling clock of the A / D converter via a data transition following the feedback cycle to a voltage controlled oscillator (not shown for clarity). The digital demodulator also controls the gain in the downstream stage of the RF transceiver via a voltage gain control. The advance correction decoder performs decoding errors via the Viterbi algorithm convolutional decoding and Reed Solomon and pass ATM cells recovered transceiver (5) transmission convergence. The transmission convergence transceiver detects the frame start ATM cell and counts the time slots within the frame to filter ATM cells which are not intended by the user. The ATM cells intended by the user are passed to the segmentation (SAR) and reassembly (6) device, which builds high-level packets to be passed to the data interfaces. The in-band ATM signaling cells are passed directly to the central processing unit (7) which interprets the commands. In the transmission direction, the central processing unit maintains a map of time slots which is loaded to the transmission convergence transmitter. As the high-level packets from the data interfaces are segmented into ATM cells, the transmission convergence transceiver loads them into prescribed time slots from upstream box. The signaling cells in bandeither they require session or they respond to a choice they are passed from the central processing unit to the segmentation device t reassembly for insertion in the upstream box. Alternatively, the transmission convergence transceiver can recognize and direct ATM signaling cells in band to and from the central processing unit and bypass the SAR device, or the transmission convergence transceiver and the SAR can be combined into a single device. The ATM cells packed on the upstream frame are passed to the forward error correction encoder (8) which then sends the string serial to the modulator (9) for modulation on the bearer. The time symbol of the modulator is coherently referenced to the received time symbol retrieved via a frequency synthesizer or numerically controlled oscillator (NCO) (10) The symbol time can be adjusted to ensure the alignment of the time slot by a -cuito (11) consumer of watch or other means. The modulated signal is then frequently converted to the desired RF frequency by the RF transceiver. The power output level is controlled by the CPU of the power level measurements from the feedback AGC of the digital demodulator to the RF transceiver and of the bit error capacity estimator in the forward error correction device. Base Station Equipment Figure 4 shows the block diagram of the base station equipment. An RF transceiver (1) in interface with the antenna and performs the amplification of the signal, forms a lowering of RF conversion to baseband and control, gain to provide levels s own to the analog digital converter (2) (A / D). The digital demodulator (3) retrieves the carrier and the time symbol of the input signal and passes the transient decision demodulated data to the forward error correction decoder (4). The forward error correction decoder performs convolutional decoding via the Viterbi algo-rhythm and Reed-Solomon decoding and passes recovered ATM cells to the ATM switch (5). The ATM signaling in-band cells are passed directly to the central processing unit (6) which interprets the response requirements and choices. When the base station chooses a user by status and health, it will read the compensated time of the user from the time counter (7), and the compensated user frequency and signal level of the digital demodulator. The corrections to these are assembled in ATM cells in band and passed to 1 ATM switch for insertion to the chain down frame. The time slots in the downstream frames are filled with cells by the ATM switch according to the typical programming functions of switches with the exception that ATM switches insert the frame start cell received from the central processing unit to exact intervals. The ATM cells are then coded for advance error correction (8) and modulated (9) to form a chain below RF. The RF transceiver converts the signals downstream to radio frequency. The central processing unit adjusts the transmission power level according to the feedback of subscriber bit error capacity measurements to the main station in the upstream network manager in the choice of response ATM cells. VARIATIONS The following variations will be obvious to a trained observer and are also claimed: 1. The use of alternate data rates results in a different number of time slots per frame. 2.-The use of other means than ATM switches to route ATM signaling cells in band to the CPU in the base station. 3.-The use of other means than the SAR device to route ATM signaling cells in band to the CPU on the user's equipment. 4. -Location of containment cells and survey response cells within the chain up frame. Depending on the processing capacity, this can be advantageous for locating the choice response time slot in the middle of the upstream frame, such that the subscriber can respond within the same frame period. 5. - The use of alternative circuits to adjust the time that the user transmits time slots with respect to the implementation of a network protocol for ISDN-broadband wireless. The use of alternative circuits for unrelated applications are not claimed. 6. -Other measures of power level received by the user equipment such as monitoring AGC settings, previous capacities of bit error rates to decode forward error correction, etc. While the invention has been described in connection with preferred embodiments, it will be appreciated that various other modifications and adaptations of this invention will be obvious to those skilled in the art.

Claims (1)

1. CLAIMS 1. An RF communication system to control the communication between a base station and a plurality of stationary user stations, said base station and said user stations having RF transceivers and each of said stationary users having a high frequency antenna. Directional gain, the improvement comprises in combination: Means for effecting time division multiplexed communications from said base station to said stationary users, Means for providing division multiple access time slots communications from each stationary user, respectively, to said base station including means for actively assigning time slots to each user and means for synchronizing the frame timing from each transceiver user, respectively with the frame timing between said base station and said stationary users, each of said time slots carrying a frame cell. asynchronous transfer mode (ATM) and where the first of the time slots in the communication between said base station and said carrier of ATM start cell, 2. In an RF communications system to control the communication between a base station and a plurality of stationary user stations, said base station and each of said user stations have RF transceivers and each of the stationary users have a high gain directional antenna, the improvement comprises in combination: means for performing time division multiplexed communications in the downstream direction from said base station to said stationary users, the time slots in said downstream direction having a synchrony byte, an ATM cell, and not guard time (band), means to provide time division access time slot communications in the upstream direction from each of d icho stationary user, respectively, to said base station including means for actively assigning time slots for each user and means for timing the synchronization frame from each user transceiver, respecively, with frame timing between said base station for said users stationary, time slots in said upstream direction having two preamble octets, one of ATM cells, and one of time octet (band) of guard, each of said time slot being divided into transfer mode primes. asynchronous (ATM) and where the first time slots in the communication between said base station and said carriers carry an ATM cell box of start 3. The RF communication defined in clause 2 where the frame periods in both directions upstream and downstream they are approximately but not greater than six milliseconds in length to allow voice traffic release with minimal latency. 4. The RF communication system defined in clause 2 incorporating: a) the carrier continuous downstream, without the pulse-shaped filtering, with frequency channels of synchronous symbols and spaced 1 / TD apart where TD is the period of one chain down modulation symbol; b) the upstream is burst mode with 24% excess band with high deep cosine filtering with frequency channels spaced 1.25 / TD apart where TD is the period of a modulation symbol upstream; c) QPSK modulation or alternatively 16 QAM is used in the upstream and downstream chain; d) a concatenated Reed Solomon (60.54) over GF (256) and convolutional code speed 7/8 is used in the downstream chain and e) A Reed Solomon code over GF (256) is used in the upstream chain. 5. The RF communication system defined in clause 2 also incorporating means to control plane functions with: a) signaling in band through ATM cells with reserved VPI / VCIs such that the requirements for acquisition, demodulation and correction of forward error are uniform across the planes of data management and control of the network protocol; b) access control transmission convergence layer means with actively assigning time slots in the upstream direction to facilitate multiple bandwidth demands by multiple users; c) continuous time slots at the beginning of the upstream box being used to enter the network by users whose two-way time range has not been resolved to avoid mutual interference, where the users who put the remnant of the network into the network put time slots until their timing is aligned; d) survey sessions are conducted on a containment basis through random access of network entry time slots; e) Carrier control plane for survey of service surveys in the payload of the ATM start cell in the chain box below. 6. The RF communication system defined in clause 2 further incorporating: Means for administering plane functions provided through: a) baseband signaling through ATM cells with reserved VPI / VCIs such that the acquisition, demodulation and forward error correction are uniform across the control and data management planes of the network protocol; b) user surveys by the base station, with users responding in dedicated time slots in the upstream box; c) plan administration of choice surveys in the payload of the ATM start cell in the downstream box; d) the synchronization of time slots 5 upstream is maintained within + -2 modulation symbols through timing control to correct the difference of ranks from the base station to each user by enslaving the simulated bolus of user transmission clock to its received clock symbol; e) upstream power control is employed to ensure the strength of the proper signal received at the base station 15 while the adjacent cell interference is minimized. 7) The RF communication system as defined in clause 2, said base station including: a) means for routing ATM cells of the baseband signaling by the ATM switch to and from the central processing unit, b) edios to measure the timing compensation by subscribers through pe riods of account of the clock-reference symbol from a master time frame for Baker sequence detection of the transmission received from the user; c) means for measuring the level of the signal received via bit error rate estimation or relative received power level for closed meshes of power control of the user transmitter. 8) The RF communication system defined in clause 2, said base station including: a) means for routing ATM cells in baseband signaling to and from ATM switches or segmentation and reassembly devices to the user equipment of the processing unit central; b) power transmission adjustment based on received power level and power control commands via signaling of ATM cells from the base station; c) means for enslaving the transmission of the clock reference symbol; d) means for adjusting the transfer timing of the clock symbol to minimize the interface to other users. 9. A wireless two-way time division point-to-multipoint communication system including base stations and user, the base station using a frequency band and the user stations using another where, the modulation of the transmission from the base station comprises groups sequentially transmitted from digital data cells, and one such cell contains both data messages for a particular user or user stations, in each data frame transmitted from a user station to the base station comprises zero cells or more of structures similar to those of the base station transmissions, transmitting discontinuously and such that in regular operations, the cells transmitted by the user station occupy the same time interval as those of other user stations, tables of cells transmitted by the stations of users are synchronized to the frames transmitted by the base station, such that a user to a box of the base station follows each base station to the user box and each base station transmits frames starting with a single box of start cell. 10. A communication system as described in clause 9, characterized in that said frame of the base station to the user station and the transmissions from the user station to the base station are approximately six milliseconds in duration. 11. A communication system as defined in clause 9 where the transmissions from the base stations to the user employ a modulated carrier signal with an a = 0.23 high cosine depth filtered digital signal the structure of each data cell is described in the method standard asynchronous transmission (ATM) modulation e a combination of 4-phase modulation and multilevel amplitude modulation and error correction is completed by concatenated forward error correction coding using a Reed Solomon code applied to each set of four adjacent cells and data. 12. A communication system as described in clause 9 where cell transmissions from user stations employ modulated carrier stagnation with a = 0.23 high-cosine-filtered deep digital signal, the structure of each data cell is such that it is described in the standard asynchronous transmission method (ATM), the transmitter method is standard asynchronous (ATM), the modulation is manipulated in quadrature phase shift, and the error correction is completed with forward error correction coding using Reed Solomon code applied to each transmitted data cell. 13. A communication system as described in clause 9 where the means of access control is carried out by: transmission of control access related information within cells and ATM standard data having unique identifiers that identify the data that they contain, thus enabling any cell containing a control message or control data, access control means associated with the base station which, based on the requirements made by the user stations, dynamically allocate cells (slots of time) in the user for the transmission of base station frames to facilitate the demands of user stations, where the cells or cells assigned to each user station are transmitted in the start cell box of the base station box , the time periods at the beginning of the base to the user for the frame sequence set together for transmissions by user stations and Intrantes to the network until they can be detected, recognized and assigned cell slots in a user subsequent to the base station box, cancellation of ATM cell time periods, in tables of user base stations, to be used by user stations that have previously joined the network but have not recently required data transmission cells, where the recognition of service requirements by user stations are made by means of access control through data within ATM cells of frame start. 14. A communication system as described in clause 9 wherein the administration of system synchronization and the power control functions are carried out by transmission of management system commands or requirements in the boxes of the control cells. I start at the base station each user station slaves its transmission clock timed derivations from the received one, where the cell or cells assigned to each user station are transmitted in the start cell box of the base station box. periods of time at the start of the user-defined base-to-user sequence frame for transmissions by user stations entering the network until they can be detected, recognized and assigned in slot cells in a user subsequent to the base station box, periods of ATM cell time, voided in tables of user-to-base stations, for use by user stations that have previously joined the network but have not recently required to transmit data cells, where the acknowledgment of service by the user stations are made by access control means through data within the ATM ATM cell frame.