MXPA98008737A - Systems and methods ds-cdma compressed mode multi-cod - Google Patents

Abstract

Discontinuous transmission introduction in CDMA communication techniques is achieved by selectively employing additional spreading codes for a data frame. By dividing a table into two or more portions and dispersing each portion with a different scatter code, the table can be transmitted in a compressed mode where the information is transmitted during a portion of the table period, leaving an inactive part of the table where other functions are performed such as evaluation of other frequencies for use in transfer between frequencies

Description

METHODS AND METHODS DS-CDMA COMPRESSED MODE MOLT -CÓD-GO AUTECBDBMTES PE INVENTION The present invention relates to the use of techniques and multiple access communications with division of code (CDMA = Code Division Multiple Access) in radio communications systems cellular telephony and more particularly to a method and system related to transfer of connections between frequencies using multiple access transmissions with non-continuous direct sequence-code division (DS-CDMA). DS-CDMA is the type of spread spectrum communications. The communications of this spectrum have existed since the time of the Second World War. The first applications were predominantly oriented by military character. However, there is currently an increased interest in using dispersed spectrum systems in commercial applications. Some examples include digital cellular radio, land mobile radio, in satellite systems and personal communication networks referred to herein selectively as cellular systems. Currently, channel access in the cellular system is achieved using multiple access methods with frequency division (FDMA = Frequency Multiple Access Division) and multiple access with time division (TDMA = Time Division Multiple Access). In FDMA, a communications channel that is a simple radiofrequency band in which a signal transmission energy is concentrated. Interference with adjacent channels is limited by the use of pass filters, which substantially pass signal energy only within the specified frequency band. In this way, with each channel assigned to a different frequency band, the capacity of the system is limited by the number of available frequency bands as well as limitations imposed by the frequency reuse restriction. In TDMA systems, which do not employ frequency hopping, a channel consists of a time slot in a periodic stream of time slots over the same frequency band. The time slots are called a box. A certain signal energy is confined to one of these time slots. Adjacent channel interference is limited by the use of a time gate or other synchronization element that passes received signal energy at the appropriate time. In this way, the problem of interference of different levels of relative signal strength is reduced. With FDMA or TDMA systems (or hybrid FDMA / TDMA systems), one goal is to ensure that two potential interference signals do not occupy the same frequency band at the same time. In contrast, multiple access with code division (CDMA) is an access technique that uses sparse-spectrum modulation to allow overlapping signals in both time and frequency. There are a number of potential advantages associated with CDMA communication techniques. The capacity limits of CDMA-based cellular systems are projected to be higher than the existing analog technology as a result of the properties of broadband CDMA systems such as improved interference diversity and voice activity switching. In a CDMA system, the data stream to be transmitted (ie a stream of symbols that is subject to channel coding, etc.) is printed on a much higher speed data stream as a signature sequence. Typically, signature sequence data (commonly referred to as "fragment" (chip)) are binary and quaternary, providing a stream of fragments that is generated at a rate that is commonly referred to as "fragment velocity". One way to generate this signature sequence is with a pseudo-noise (PN = pseudo-noise) process that appears random but can be replicated by an authorized receiver. The symbol stream and the signature sequence stream are combined by multiplying the two streams with each other, assuming that the binary values of the two currents are represented by plus one or minus one. This combination of the signature sequence stream with the symbol stream is called dispersing the symbol stream signal. Each symbol or channel stream is typically assigned a unique scatter code. The relationship between the velocity of fragments and the symbol velocity is called the dispersion velocities. A plurality of scattering signals models a radio frequency carrier, for example by quadrature phase shift keying (QPSK), and is jointly received as a composite signal in a receiver. Each of the scattering signals overlaps all other scatter signals, as well as signals related to interference, both in frequency and time. If the receiver is authorized, then the composite signal is correlated with one of the unique codes and the corresponding signal can be isolated and decoded. For future cellular systems, the use of hierarchical cellular structures will prove to be valuable even to further increase the capacity of the system. In hierarchical cellular structures, smaller cells or micro cells exist within a large cell or macocell. For example, micro-cell base stations can be placed at the street lamp level on urban streets to handle the increased traffic level in congested areas. Each micro cell can cover several blocks of a street or a tunnel, for example while a macro cell can cover a radius of 3 to 5 kilometers. Even in CDMA systems, the different cell types (macro and micro) will operate at different frequencies to increase the capacity of the total system. See H. Eriksson et al. , "Multiple Access Options For Cellular Based Personal Comm." (Multiple access options for cell-based personal communications), Proc ,. 43rd Vehic. Tech. Socf Conf ", Secayicus, 1993.

Reliable transfer procedures must be sustained between different cell types, and thus between different frequencies, so that mobile stations moving between cells will have continuous support of their connections. There are several conventional techniques to determine which new frequency and cell will be chosen among multiple transfer candidates. For example, the mobile station can assist in determining the best transfer candidate (and new associated base station) to the station to transfer the communications. This process, typically referred to as mobile assisted transfer (MAHO = mobile assisted handover), involves the mobile station periodically (or on demand) making measurements at each of several candidate frequencies to help determine a best transfer candidate based on some predetermined selection criteria (for example RSSI more strongly received, better BER, etc.). In TDMA systems, for example, the mobile station can be directed to scan a candidate frequency list during one or more slots of idle time, such that the system can determine a reliable transfer candidate, if the signal quality in its Current link degrades below a predetermined quality threshold. In conventional CDMA systems, however, the mobile station is continually occupied with receiving information from the network. In fact, CDMA mobile stations usually receive and transmit continuously in both uplink and downlink directions. Unlike TDMA, there are no idle or inactive time slots available to switch to other carrier frequencies, which creates a problem when considering how to determine whether a transfer to a given base station at a particular frequency is appropriate at a particular time. Since the mobile station can not provide any interfrequency measurements to a transfer evaluation algorithm that operates either in the network or in the mobile station, the transfer decision will be made without full knowledge of the interference situation experienced by the station. mobile and therefore can be unreliable. A possible solution to this problem is to provide an additional receiver in the mobile unit, which can be used to take measurements at candidate frequencies. Another possibility is to use a broadband receiver that is capable of simultaneously receiving and demodulating several carrier frequencies. However, these solutions contribute complexity and expense to the mobile unit. In the main patent application granted to Willars et al., This problem is addressed by introducing discontinuous transmission in CDMA communication techniques. For example, a compressed transmission mode is provided using a lower dispersion ratio (i.e. by decreasing the number of fragments per symbol) such that at a fixed fragment rate, the scatter information only fills a part of a frame . This leaves parts of each frame, here referred to as a resting part, during which the receiver can perform other functions, such as the evaluation of candidate cells at other frequencies for transfer purposes.

This solution is easily applicable to CDMA systems, where non-orthogonal code words are used to disperse the sequence of information data. In these types of systems, commonly referred to as "long code" systems, a signature sequence is much longer than a symbol (often billions of symbols long). Since these codes to begin with are not orthogonal, the temporal change of the dispersion relation of one or more channels to provide compressed mode transmissions does not create extra inter-code interference. The solution proposed in the main application becomes problematic however for DS-CDMA systems, where orthogonal code words are used to disperse data stream. In so-called "short" code systems, a set of short codes (including, for example, 128 codes with a length of 128 fragments) is chosen, such that all the codes are orthogonal to each other over a symbol interval. say about the length of a code. If this dispersion tower is altered for transmissions in the downlink to a user in this type of system, this user code will not be more orthogonal to the other users over a symbol interval. This in turn would create undesirable inter-channel interference potential.

Accordingly, it would be convenient to provide a DS-CDMA system where the transmission and detection is discontinuous but not based on a reduction in the dispersion ratio, to provide a resting or inactive time for the receiver, to measure frequencies different COMPENDIUM The introduction of discontinuous transmission in CDMA communication techniques is achieved by selectively employing additional dispersion codes to disperse information within a frame. For example, in a system that normally employs a spreading code, to disperse data over the entire frame period, two or more codes may be employed in a compressed transmission mode. By using two or more codes to disperse the data stream associated with a frame, the encoded information only fills a part of a frame's information in a compressed mode, leaving a resting part of the frame where other functions are performed, such as evaluation of other frequencies to use in transference between frequencies. In accordance with an exemplary embodiment of the present invention, compressed mode transmission can be achieved by dividing a frame data value into two or more frames. Each portion can then be sent to a different short code modulator, where it is modulated and dispersed with a different code. Alternatively, providing multiple codes may occur within the short code modulator. A mode control device, for example, can determine whether the output of frames from a modulator is processed in accordance with a normal transmission mode or a compressed transmission mode. If processed according to the compressed mode, the modulated frame output is divided into two or more portions. Each portion is dispersed using a different code. When using one or more additional codes for a data frame, the time it takes to transmit that frame is reduced, leaving a period at rest during which the receiver of a mobile station can tune to one or more different frequencies to take measurements. These measurements can then be used to increase transfers according to known techniques.

The foregoing and other features, objects and advantages of the present invention will be apparent from the detailed description set forth below when measured in conjunction with the drawings wherein: FIGURE 1 is a schematic illustration of a radio-sealing system; FIGURE 2A is a schematic illustration of a descending traffic information processor in accordance with the present invention; FIGURE 2B is a schematic illustration of a short code modulator according to an embodiment of the present invention; FIGURE 2C is a schematic illustration of a base station transmitter in accordance with an exemplary embodiment of the present invention; FIGURES 3A and 3B are exemplary of normal mode transmission and compressed mode transmission respectively for 4 frames; and FIGURE 4 is a block diagram of an alternative embodiment of the short code modulator that can provide both normal mode and compressed mode transmissions. n f yr * rt? | ' pirT? TfiirVW In the following description, for purposes of explaining and not limiting, specific details are established, such as partial syirrites, somirs of sirsuites, techniques, etc. in order to provide a complete understanding of the invention. For example, various different details are provided to exemplary transmission techniques and modulations. However, it will be apparent to a person skilled in the art that the present invention can be practiced in other embodiments that deviate from these specific details. In other cases, detailed descriptions of well-known methods, devices, and sirsuites are omitted so as not to obstruct or block the desscription of the present invention are unnecessary details. A system of exemplary casting radius somunisasiones 100 is illustrated in Figure 1. As shown in Figure 1, a geographic region served by the system that sub-divides into a number, n, of smaller regions of radius soosides soo seldas llOa-n, sada selda has asosiada a base stasis of respectable radius-170a-n. Each radio base station 170a-n has a plurality of radio antennas and resection transmissions 130a-n. It should be noted that the use of the hexagonal shaped lyoa-n seals is employed as a convenient graphical way to illustrate radio coverage areas associated with a particular base station 170a-n. Currently, cells llOa-n may be irregularly shaped, overlapping and not necessarily contiguous. Each cell llOa-n can also be sub-divided into sectors according to conosidos methods. Distributed within the selle llOa-n without a plurality, n, the movable positions 120a-m. In pristine systems, the number of mobile stations is greater than the number, n, of stations. The base stations I70a-n, include, among others, a plurality of base-stationary transmitters and base-stanters (not shown) that provide two-way radio with the mobile stations 120a-m located within their respective cells. As illustrated in Figure 1, the base stations 130a-m are coupled to the mobile telephony switching office (MTSO) which provides, among other things, a connection to the switched telephony network public (PSTN = Public Switched Telephone Network) 160 and from there to the 180a-s somunisation devices. The sonic seal is known by those who are skilled in the teas, and therefore is not described further here. In accordance with the present invention, the radio links between the base stations and the mobile stations are effected using multiple asseso are division of direct-signal code (DS-CDMA). In the following, the term "dessendente", or sanal de avanse, refers to the radio transmission of signals that are information from the base stations 170a-n to the mobile stations 120a-m. Similarly, the term "uplink" or "reverse channel" refers to the radio transmission of signals containing information from the mobile stations 120a-m to the base stations 170a-n. In astuality, radio communication systems are used for an ever-present structure of applications. The somunisasiones of tradisionales data now coexist with the transmission of images, and a mixture of other applications of data of high velosidad and means. These aplissations require a radio channel capable of transporting a variable mixture of information signals of low, medium and high volatility, they are a low transmission delay. To be an efisient of the radio spectrum, only that bandwidth that is required for a particular application must be assigned. This is known as "bandwidth on demand". Accordingly, the following exemplary systems describe a multi-speed DS-CDMA system. Descending Link Figure 2A illustrates a schematic block diagram of a downlink traffic information processor 200. The downlink traffic information processor 200 is part of the base station transmitter. Each downlink connection requires the resources of at least one downlink traffic information processor 200. A base station that is dimensioned to supply a number K of simultaneous downlink connections should have at least an equal number K of processors of traffic information of downlink 200. Referring to Figure 2A, downlink data traffic information data is variable velosity of 205, such as for example image or speech information originating from an information source (not shown) which is received by the frame selection buffer 220 in the form of a variable rate digital bit stream. The source of information for example may be an ordinary telephone 180a, a 180b computer, a 180c video camera, or any other source of sound information that is linked by PSTN 160 to MTSO 150, or to MTSO 150 directly and thereafter blows base sequences 170ar-n of agreement are sonocidos methods. The speed (ie number of kilobits per second (kbps)) of the variable velocity bitstream received by the frame selection buffer 220 depends on the type or amount of information that is transmitted to the mobile stations 120a-m . The bit rate can be defined by: Bit Veils = (Basic Bit Veils) * k; k = »0,1,2, ... N where (Basically Bits Veil) * N is the maximum bit velocity. In an exemplary embodiment having a base bit rate of 32 kbps and a time interval of 10 ms of information, the information subfield contains 320 bits. For bit overflows of more than 32 kbps, more than one information subset for 10 ms of time interval was produced. Suppose, for example, that the bit rate is 128 kbps. Then, swapping information suds, for one that suffers 320 bits, they are produced by a 10 ms interval of time. In general, the number M of information supers is the same as the number of multiples of the basic bit rate. With referensia again to Figure 2A, the information dash is blown to one of a plurality of sorto code modulators so-called 210a-M, for sub-stringing. The M number of sodr modulators sorto 210a-M is equal to the number N of possible multiples of the basic bit velocity. According to a first exemplary embodiment of the present invention, when the velocity of data bits of received information is the base bit rate (for example, 32 kbps), only one information subset is produced per day over a time interval that it is blown to the short code modulator 210a. When the received variable-rate bit stream is twice the basic bit rate (it is 64 kbps), two information frames are produced for each 10 ms time slot: an information frame is coupled to the short code modulator 210a and the other information box is coupled to the short modulator 210b. Similarly, the higher received variable rate bit stream produces a larger number of information frames per predetermined time slot. Each information frame resulting from high bit rate information data is separately blown to a separate soot modulator, resulting in a plurality of parallel short code channels, so-called. Arranging the bit stream of information data in a sequence of information frames, allows the information data to be conveniently processed in short code modulators 210a-M. Reference is now made to Figure 2B, a schematic illustration of the short code modulators 210a-M, is generally illustrated as 210. Before coding of sanal in the sonvolusional sodifisator 230, the first transmitted bits of sontrol and error verifisation (Xt ), which include, for example, a portion of the encryption redundancy coding bits (CRC = syslis redundans and shesk) are added to the information sub-table in the time multiplexer 220. l the frame comprising the information bits and the first transmitted bits of sontrol and error verifisation, they are blown to convolutional encoder 230 and subjected to channel coding using for example a one-third volatile convolutional codifier that adds redundancy to the sub-frame. The supersized superscript is then beaten to the bit harvester 240 where the supersized suffix is subjected to bit interleaving in a block fashion. After interleaving, the second transmitted control bits and error check X2 are added to the superseding and interleaved supersession in the time multiplexer 250. The downlink power energy bits are also added to the superseding / interleaved supersession in the multiplexer of time 260. The bits of the downlink energy source instruct the mobile station to increase or decrease its level of transmitted energy. After insertion of the energy control bits, each frame is coupled to the Quadrature Phase Shifted Cipher Modulator (QPSK) 270. Those skilled in the art will appreciate that modulations other than QPSK may also be employed. The QPSK modulator aliases the power bits or symbols in a symbolic set of symbols. The output of the modulator are QPSK is a complete sesuensia of symbols represented for example by soordenados sartesianas in the usual form I + jQ. The dispersion of the output of the QPSK modulator is done using sorta codes so named in block 280. Other coding sorabinasiones, interspersing and modulation are possible. Short Codes Again refer to Figure 1, since the radio base station 170a-n transmits a single desense signal to allow the mobile terminals 120a-m to separate the signals transmitted in adjacent signals or discrete signals (it is known as inter-signal signals). seldas), of the dessendente signals in dessedente resibidas in the selda where the mobile terminal is located. In addition, the signals transmitted to individual mobile terminals in a particular cell are orthogonal to each other to separate the signals of the multiple mobile stations 120a-m operating in the same cell (ie inter-cell signals). According to the present invention, downlink transmissions to multiple users in the same packet, or same sestor, are separated by dispersion of the modulated signal are different orthogonal sortos codes.

Parallel sorto channels that represent a signal of high velocity of bits, are separated from each other in the same way as traffic signals from dessending to the mobile terminals that can be separated from each other, designating different codes sortos. (real) are sada sanal parallel CDMA. In one embodiment, orthogonal sortos are orthogonal Gold codes of real value, they are a symbol interval length. For example, they are a total bit rate of 120 kbps (60 kbps of sada quadrature branch) and the CH1 speed of 7.68 Msps, the length of code is 128 fragments. Orthogonal Gold Codes are ordinarily Gold Codes of length 2"-l, where a sero or one is added at the end of all the scode words producing 2" orthogonal scripted words, one of length 2. "Gold codes are known by those skilled in the art, again with reference to Figure 2A, Gold codes are provided by the code generator sorto 207 to one of the sorto modulators sorto 210a-M, although only one signal line is illustrated between The code generator Sorto 207 and the code moderator Sorto 210 are, in accordance with exemplary embodiments of the present invention, multiple sets of standard codes can be supplied to modulator 210, to operate discontinuous transmission as described below. The sorto second modulator 210a-M is blown to the adder 215 where the scattering signals individually from each information source are formed in a single composite signal a. Long Codes Now with reference to Figure 2C, the aggregate signals from the information processor for downlink traffic 200A-K are coupled to the base station transmitter 150. The signals from each downlink information processor are despread they are added in block 290. In order to separate outgoing signal signals from different base stations, the base station 170a-n is assigned a single long code. In one embodiment of the present invention, the long code can be of a very high value: for example, an ordinary Gold code of length 21_1 fragments. After siphoning (in blocks 300 and 302) the composite signal with the long codes, the signal is generated by the long code generator 285 converted filtered (blocks 308, 310), sum (block 312), amplified and transmitted in accordance with known technicians. Discontinuous Transmission Normally in CDMA systems, the information is transmitted in a frame structure with fixed length, for example 5 to 20 ms. The information to be transmitted within a sub-section is sodifised and dispersed in a set. This information is dispersed over the other side, resulting in continuous transmission throughout the whole at a steady energy level, as illustrated for example in Figure 3A. This type of continuous transmission of complete frames is denoted here as "normal mode transmission: As discussed earlier, the present invention introduced discrete transmission in CDMA systems, for example, for the evaluation of a reliable transferensia sampler. the present invention, this is achieved by using additional scatter codes to transmit a data box, this results in codified information that is squeezed in a portion of a sudo, leaving a resig, interval at rest in the sual no energy is transmitted, This is referred to herein as "compressed mode transmission." An illustrative example will serve to explain, in addition, the at-rest or inastive intervals can be understood in accordance with the present invention. the present invention, additional scatter codes can be used to transmit n Data surto using more than one sounder modulator 210 to transmit all data. For example, with reference to Figure 2A, in the table selection buffer 220 can be directed to divide an information subfield into two portions, each of which is supplied to a different short code modulator 210. Since the data is they divide into two portions, they will only be one half of the subara durasion, and they are transmitted as the output s (p) in Figure 2C. Those skilled in the art will appreciate that if more time is required at rest, the sub-frame selection buffer 220 can be instructed to divide the sub-frame into three or more spindles and send the subframe splits to three or more short code modulators. Another way in which the additional codes can be used to clarify a compressed transmission mode is by modifying the short code modulators 210, to be used selectively as a set of primary codes M (for normal mode) or both the set of codes. primary codes M, as a set of secondary codes N (for squeezed mode) to disperse a sub modulator data, as illustrated in Figure 4. There, the output of the QPSK modulator 270 is fed to the mode 400 control device. The mode control device 400 will decide whether the normal transmission mode is appropriate for a particular data frame supported by the QPSK 270 modulator or if the squeezed mode is appropriate. The separation of the normal transmission squeezed is based on the freshness in which mobile stations are required to make measurements on candidate transfer channels. This frequency is determined are based on various sonorous factors that are dexterity in the specificity, including for example an algorithm of transferensia partisular insrementado within their subjects. If the mode control device 400 determines that the received subfield is to be transmitted by expressing the normal mode, then all the modulated bits for that frame are sent to block 280, where they are dispersed with one or more short codes supplied from the generator of sorta codes 207 from a primary set M of sortos codes. The dispersion formation sesuensia is then performed to the adder 215 where it is added are similar sesuencias of other short code modulators. If, on the other hand, the mode control device 400 determines that the subframe is to be transmitted in the squeezed mode, then the bits are separated into two slices. A first portion is directed to block 280, where one or more subsidiary codes are dispensed within the set M, while the second portion is directed to block 402 where it is dispersed with one or more short codes received from the code generator. sortos 207 that is part of the N set of secondary sortos codes. The mode control device 400, for example, can include a demultiplexer (not shown) to divide the frame into two portions. For example, the first Z / 2 bits in a Z-bit frame can be sent to the block 402 and the last A / 2 bits can be sent to the block 280. In this way, the compressed mode operates to disperse the data over the middle of the period of suadro when using the codes. Those are skill in the specificity that if more time is necessary for a mobile reseptor to tune to other frequencies for measurement purposes, more codes may be employed to further reduce the amount of time spent transmitting a frame in compressed mode. The mobile station can be alerted to transmissions in compressed mode by a message that is provided in an associated control channel (for example, the FACCH). This message can be transmitted using a primary code so that it is read first. Use of Rest Time Having created the resting time for a mobile stasis structure, this resting time can be put into a holiness of advantageous uses. First, the reseptor can use this time to explore other fresuensias. The evaluation of carrier mills different from those that are astutely assigned to a mobile station to base transferensia destions, is done by using the transmission mode squeezed in the downlink or inbound link in a predetermined, regular basis. The mobile station performs measurements (for example carrier signal strength, pilot channel signal strength or bit error rate) in other carrier mills during the rest part of the sub-table in a squeezed mode, since during this time it is not necessary to The base-to-sual connection is currently linked in. After switching to another frequency, the evaluation of that frequency can be carried out in any convenient manner, for example, as disclosed in US Patent No. 5,175,867 issued to Wejke and The mediations are also retransmitted to the network (through the base link (s)) providing the information used for the mobile-assisted transfer (MAHO). The compressed mode is used intermittently at a speed determined by the network or mobile station in this exemplary mode, however it may be preferable for the network to control the use of mobile do compressed for the dessendente link. The network or mobile stasis can determine the freshness of the use of the squeezed mode are based on a variety of phasers, such as radio propagation sonsions, the velosity of mobile stasis and other partisipatory phasers, the relative call density and proximity to edges of selda, where transferensia is more likely to be required. This information, in conjunction with the details and measurement transfer algorithms employed in the system, can be used by the mode control device 400 to determine whether the mode of transmission squeezed or normal transmission mode is to be selected. The axon transference of a call transfer can also be handled in the squeezed mode in an exemplary embodiment of the present invention. Two different transferensia prostheses can be implemented using the rest time that is provided by the somprimido mode, espesífisamente transferensia without sustenta and dual transferensias. For purposes of transferensia without support, the mobile stationary receptor can use the resting time to accommodate time slots from the new base stasis and use synnosynchose sonoside tesselines to syncronize to the new base staion before the transferensia wakes up. This way, the transferensia process was stabilized by establishing the sommunication with the new base station before withdrawing its connection with the old base station. For mild transferensia, after desing transferensia to a new base station (or base stations) spreading to another carrier frequency, the compressed mode is accessed. The communication with the old base station (s) is maintained while a new connection is established during the rest portion of the subfield. By maintaining the old link (s) after the new link is syncronized, the somunisation to all the base stations can simultaneously be used for (establishing macro density in two or more carrier frequencies) the scheme having a method that is effected before being interrupted. This scheme for mild transferensia interfresuensias can be effected for ascending as well as dessendentes enlases. Transferensia becomes severe when the old link (s) are removed and return to normal transmission. The service cisland of the information part of a suadro to the end of the subframe is sonrola in a base of suadro by suadro. For axes of diversity of masro, between two fresuensias, the same information is sent in both. Therefore, the service system should be approximately 0.5. The compressed mode is used intermittently and the normal mode (service time = l) is used the rest of the time. In order to control the transmission output, the transmission energy used during the information part of a dash is a function of the transmission system., in an exemplary embodiment of the present invention. For example, the transmission energy P can be determined somo: P = E, Cislo de Servicio where P-. = energy used for transmission in normal mode. This increased energy is required to maintain the transmission quality in the detector if the service lock is redused. During the rest of the suadro, it is desir the part of rest, the energy is interrupted. Alternatively, the base station of Figure 2C may be implemented in such a way that the downlink traffic information processor 200A-200K has its own associated I-Q modulator, the outputs and which are summed together. In this modality, the control of energy will be inherent to the process. The multiple in the total transmitted energy from a base station can be smoothed by time-shifting the deployment in the squeezed mode upon a user number being redrawn in a short time extension. Since the measurement of signal strength in another carrier mill, probably requires only one shot of a subframe, the servisio system can be ignored, thus reducing the variation in energy transmission. The use of the present invention of frames in a normal and compressed mode, provides the ability to exploit the advantages of slotted transmission / resection in substrates of hierarchical cells, whereas DS-CDMA is used but without reducing the scattering recession. This makes it possible to invade other carrier frequencies, thus providing reliable transfer decisions. In addition, the execution of transferensia between carrier frequencies can be done seamlessly by stablishing a new link before releasing the old or old one. This can be effected without weight by two resepters. The presedent dessripsión of preferred modalities is provided to allow any person is skill in the espesialidad the haser and use the present invention. Various modifications to these modalities will be easily apparent to those with skill in the espesiality and the prinsipios here dessritos can be aplisted without departing from the scope and spirit of the present invention. In this way, the present invention is not limited to the described modalities, but should be granted the broadest possible scope are the appended claims.

Claims (37)

1. - A multiple asseso method is division of code in cellular communications, the method is considered because it comprises the steps of: printing, in a normal mode, a data frame to be transmitted in P signature sequencies to produce a scattered information signal; printing in a compressed mode, the data frame in symbol signature Q, where Q is greater than P, to produce a somprimised scattering information signal; and transmitting one of the scattered information signal and the scattered information signal sompressed; where a supereptrant transmitted in the squeezed mode, includes a first part that has a time duration less than the hardness of a specific time and which is a signal of sodifised information, and a second part during the sual the transmitter is at rest .

2. A method of sounding with claim 1, characterized in that an additional step of instructing a transmission energy level used during the first part of the sub-mode is performed as a function of a servise system, defined as a ratio of the length of time of the first part to the specific time duration of the sub-table in squeezed mode.

3. - A sonicity method is claim 1, which is sarasterized because no energy is transmitted during the second part.

4. A sonicity method is claim 1, characterized in that the compressed mode is used in a radio link without overshoot. They are the use of the mode squeezed in other radios.

5.- A method of soundness is the reivindisasión 2, sarasterizado because in addition the stage of smoothing several in the total energy transmitted to disperse in time the use of the suffros so squeezed on a sanctity of users in a given time extension.

6. A sonification method is claim 1, which is sarasterized because a frequency of use of the compressed mode is based on one or a combination of one or more of different factors: mobile stationary speed, interferensia twig, relative call density and proximity of selda edges.

7. A sonicity method is claim 1, characterized in that the compressed mode is used in a downlink.

8. - A method according to claim 1, characterized in that the compressed mode is used both in the downlink and in the assenting link.

9. A sonicity method is claim 1, characterized in that the compressed mode is used in an assenting link.

10. A sonification method is the claim 7, which is sarasterized because the additional stage of carrying out measurements, in a mobile stanza of carrier fresuensias during the second part of the superseding mode of the dessended line.

11. A sonicity method is claim 8, characterized in that the additional step of carrying out measurements, in a mobile station of carrier freshness during the second part of the compressed uplink frame.

12. A method according to claim 8, characterized in that the additional step of using the subarachnoid mode is synthesized in a carrier router and a new radius is established during the second part of a sub-mode.

13. A method of soundness is claim 12, characterized in that in addition a step of maintaining somunisation both in a radio used astually and the new radio is used, using the second part of the table so squeezed to somunisar the new radio link.

14.- A method of soundness is the reivindisasión 13, sarasterizado because the additional stage of removing the radio enlase used astualmente and return to a suadro transmission in a normal way, where a sudo normal mode was only of the information sodifisada by all the hardness of time espesífiso.

15. A method according to claim 11, sarasterized because the additional stages of using the mode somprimido, suando is the communication and a new fresuensia carrier syncronization and stable a new radius enlase during the second part of a suto mode squeezed.

16.- A method of soundness is the reivindisasión 15, sarasterizado because somprende an additional stage to maintain somunisasión so much in a radius enlase astualmente employed and the new radio enlase using the second part of a suopro so somprimido, to somunisar in the new radius link

17. Claim 16 is a sarasterized method because it suffers the additional steps of removing the currently used radio link and returning to frame transmission in a normal manner, wherein a normal mode frame consists of only the information sodified by all the Hardness of time thickened.

18.- A method of soundness is the vindication 10, which is sarasterized because an additional stage of performing an evaluation of trahsferensia using the measurements of the different carrier carrier in fresuensia of a carrier carrier on the sual is stable.

19.- A method of soundness is the vindication 11, sarasterized because the additional stage of carrying out an evaluation of transferensia using the measurements of a different carrier carrier in fresuensia of a carrier carrier on the sual is stable a link present.

20.- A method of soundness is the vindication 21, sarasterized because in addition the additional stages of using the somprimido suando mode are unskilled somunisasión in a new fresuensia carrier and stable a new enlase are base in the evaluation of transfer, during the second part of a box compressed mode.

21. A method according to claim 20, characterized in that the additional step of maintaining communisation in both a radio station and a new radio station is used, using the second part of a table in a sompressed manner to sleep on the radio. new radio enlase.

22. A sonicity method is claim 21, characterized by the additional steps of removing the radio link currently employed and returning to a normal frame transmission, wherein a normal mode frame consists of only the information encoded by all the hardness of time thickened.

23.- A method of soundness is the reivindisasión 8, sarasterizado because additionally somprende the adisional stage of using the mode squeezed suando axes transferensia without support when performing sommunications in a radio link present during the first part, sanshonizar somunisasión in a new fresuensia carrier during the second part, to establish a new radio during the second part, to remove the present one while the somunisation in the new radio has been established and to perform somunisasiones in the new radio using a normal mode transmission, where a subset of normal mode was only the information sodifisada for all the duration of time espesifiso.

24.- A method of sonification is the claim 11, characterized in that it also includes the step of using the mode supressed axes transferensia without support when performing somunisasiones in a radio link present during the first part, sinister somunisasiones in a new carrier freshness during the second part, establish a new link during the second part, remove this link when the communication on the new radio has been established and examine somunisasiones on the new radio using a normal mode transmission, where a normal mode It was only the information sodifised by all the hardness of a time espesífiso.

25. A method of sonification is the vindication 25, characterized in that it also comprises the additional steps of using the mode supressed superstrada transferensia without seam when performing commissiones in a radio link present during the first part, selessionar a new fresuensia carrier are base in the evaluation of transferensia, sanshonize somunisation in the new carrier frequency during the second part, establish a new radio link during the second part, withdraw the present in the same way the somunization in the new radio link has been established and carry out communisations in the new Radio link using a normal mode transmission, where a suadro of normal mode was of only the information sodifisada by all the durasión of a espesífiso time.

26.- An apparatus for transmitting information in a system of multiple assesion of scripting that transmits information in the sub-section of specific duration of time, the apparatus is considered because it appears: means to disperse data either in a normal way, in where a sub-frame in normal mode includes a scattering of information using at least one scattering code or a scripted mode where a dataset is scattered using the minimum scattering code and at least one additional scattering code; and where a squeezed suffix includes a first part lower than the specific time hardness, the first part has a signal of somatic information and a second part; means to control sual from the squeezed mode and the normal mode is used in the dispersion means; and means for transmitting an output of the means of sodifisation and separation of suadros.

27. - The sonification apparatus is the claim 26, which is sarasterized because the means for dispersing also include: a monitoring device so that it operates the normal mode for sending all the asymptotic bits is a subset to a first dispersing device that resides the code Smallest dispersion and operating in the squeezed mode to send a first portion of the asosiada bits are the data box to the first dispersion device and a second portion of the bits asosiados are the data suadro to a second dispersion device that resieves the code of adisional dispersion is minimal.

28. The sonification device with claim 26, characterized in that the mode control means choose a mode according to a transferensia / medisión algorithm.

29.- The sonicity device is claim 26, which is sarasterized because the device is part of a mobile station.

30.- The sonicity device is claim 29, which is sarasterized because it also provides means to deodify sanal with fixed dispersion ratios.

31. - The sonicity device is claim 26, characterized in that the device is part of a base station.

32.- The sonicity device is claim 28, which is sarasterized because part of the algorithm is implemented in a mobile station and part of the algorithm is implemented in a base station.

33.- The sonicity device is claim 26, sarasterized because one of the devices is located in a mobile station and another of the devices is located in a base station.

34.- The conformity apparatus is claim 26, which is sarasterized because the energy supplied to the means for transmitting during a first part of a sub-section are sonrored by the mode control device.

35. The sonicity device is the claim 28, which is sarasterized because a service system of the compressed mode board of the receiving means is controlled by the mode control device.

36. The apparatus according to claim 26, characterized in that the means to disperse insulate: a buffer of suadro that organizes input information in suadros and sends the box in a normal way to a modulator and that divides the compressed table suando less in two porsiones, one of the suals is sent to a modulator mod. 37.- A CDMA transmitter, sarasterized because it is somprende: a sodifisador de sanal, to sodifisar sonvolucionalmente a box of data bits; a modulator for the supershoot of data bits; a first scattering unit for receiving a first dispersion code; a second dispersion unit for receiving a second dispersion code; and a device for sonating mode, for passing the modulated coded subfield of data bits to the first scattering unit, when the transmitter is operated in a normal mode and for passing a first coded frame portion of data bits to the first device and a second portion of the encoded frame of data bits to the second dispersion device when the transmitter operates in a squeezed mode.