BRPI0902431A2 - bandwidth allocation base station and method for uplink bandwidth allocation using sdma - Google Patents

Abstract

BASE WIDTH ALLOCATION BASE STATION AND METHOD FOR UPLINK BANDWIDTH ALLOCATION USING SDMA. Base station configurations and uplink bandwidth allocation methods using SDNA are generally described here. In some configurations, uplink bandwidth request messages are received on a bandwidth request containment channel from one or more subscriber stations. Uplink bandwidth request messages are generated by subscriber stations by modulating pilot subcarriers of a disjoint pilot pattern, randomly selected, with a randomly selected orthogonal sequence. The base station allocates uplink bandwidth to subscriber stations when uplink bandwidth request messages are successfully detected and decoded. The base station uses an SDMA technique to determine channel responses, based on orthogonal strings, to detect and decode uplink bandwidth request messages.

Description

"Bandwidth allocation base station and method for uplink bandwidth allocation using sdma"

Technical Field

Some settings relate to bandwidth allocation in wireless access networks. Some settings are for uplink bandwidth requests and for uplink bandwidth requests to be deployed over wireless broadband networks such as WiMax.

Historic

In many conventional wireless networks, subscriber station bandwidth requests consume a large amount of overhead, and simultaneous outbound conflicts cause higher latency. Thus, devices and methods that reduce the amount of overhead for bandwidth requests are required, as well as devices and methods that reduce the latency caused by concurrently sent bandwidth request conflicts.

Brief Description of the Drawings

FIG. 1 illustrates a Space Division Multiple Access (SDMA) network according to some configurations;

FIG. 2 illustrates uplink (downlink) and downlink (downlink) substructures of an uplink bandwidth deholling process, according to some settings;

FIG. 3 illustrates tiles of a bandwidth request contention channel according to some configurations;

FIG. 4 illustrates disjoint pilot patterns, according to some configurations; and

FIG. 5 illustrates the uplink and downlink substructures of an uplink bandwidth deholling process, according to some alternative settings.

The following description and illustrations sufficiently represent specific configurations to enable those skilled in the art to practice them. Other configurations may incorporate structural, logical, electrical changes in processes and others. The examples simply characterize possible variations. Individual components and functions are optional, unless explicitly claimed and the sequence of operations may vary. Portions and functions of some configurations may be added or replaced with those of other configurations. The settings set forth in the claims encompass all available equivalents of those claims.

FIG. 1 illustrates an SDMA wireless access network according to some configurations. Network 100 includes base station 102 and one or more subscriber stations (EA) 104. In multiple access configurations, base station 102 communicates with subscriber stations 104 transmitting downlink (DL) 107 structures and subscriber stations 104 communicate with base station 102 by transmitting via uplink (UL) substructures 109. Base station 102 may include one or more maps in downlink substructures 107 to indicate the specific time and frequency at which each subscriber station 104 may receive information within the current base substructure and the specific time and frequency source at which each subscriber station 104 may transmit information within a nearby uplink substructure.

Base station 102 may include, among other things, physical layer (PHY) 112 to communicate signals with base stations 104 and signal processing circuitry (SPC) 114 to process signals received from subscriber stations 104e to process signals for transmission to subscriber stations104. In some embodiments, physical layer circuitry 112 may be configured to receive orthogonal sequences through a subscriber station bandwidth request contention channel 104. Desinal processing circuitry 114 may detect and / or decode received signals as described herein. in more detail below, to allocate uplink bandwidth to subscriber stations 104.

In some configurations, base station 102 may receive, among other things, orthogonal sequences of subscriber stations 104 via a variety of antennas103 and may use one or more SDMA techniques to help differentiate two or more conflicting orthogonal sequences. . In this way, transmissions from conflicting subscriber stations can be detected for uplink bandwidth allocation. These settings are described in more detail below.

In some embodiments, base station 102 and subscriber stations 104 may communicate using a multiport communication technique that uses orthogonal frequency division multiplexed (OFDM) signals. OFDM signals may include a variety of orthogonal subcarriers. In some of these multiport configurations, base station 102 may be part of a broadband wireless access (BWA) network communication station, such as a worldwide interoperability communication station for microwave access. Microwave Access, WiMax), although the scope of the invention is not limited to this aspect. Subscriber stations 104 may be BWA network communication stations, such as WiMax subscriber stations, although the scope of the invention is not limited in this regard. In some configurations, base station 102 and subscriber stations 104 can communicate using a multiple access technique, such as orthogonal frequency division multiple access (OFDMA). Subscriber stations can be virtually any communication device. wireless, such as a personal digital assistant (PDA), a laptop or laptop with wireless communication capability, a handheld Internet access device, a cordless phone, a wireless headset, a pager, instant messaging device, digital camera, access point, television, medical device (eg, heart rate monitor, blood pressure monitor, etc.) or other device that may receive and / or transmit information wirelessly.

In some configurations, base station 102 and subscriber stations 104 may communicate according to specific communication standards, such as the Institute of Electrical and Electronics Engineers (IEEE) standards, including IEEE 802.16-2004 and IEEE 802.16 (and ) for wireless metropolitan area networks (WMANs) including variations and evolutions thereof, although the scope of the invention is not limited in this respect as they may also be able to operate according to other standard techniques. In some configurations, base station 102 and subscriber stations 104 may operate in accordance with the provisions of the IEEE 802.16 (m) workgroup. For more information regarding IEEE802.16 standards and workgroups, see "IEEE Standards for Information Technology — Telecommunications and Information Exchange between Systems" Local and Metropolitan Area Networks - Specific Requirements -Part 16: "Air Interface for Fixed Broadband Wireless AccessSystems , "May 2005 and related versions / amendments. In some configurations, base station 102 and subscriber stations 104 may communicate according to 3GPPLTE standards.

Antennas 103 and 105 may include one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas, or other suitable antennas for transmitting RF signals. In some configurations, instead of two or more antennas, a single antenna with multiple openings may be used. In these configurations, each aperture can be considered as a separate antenna. In some SDMA and multiuser multiple input / MIMO configurations, antennas 103 can be effectively separated to take advantage of the spatial diversity and different channel characteristics that can result between each of the antennas 103. and each antenna 105. Although subscriber stations 104 are illustrated with only a single antenna 105, subscriber stations 104 may include more than one antenna.

FIG. 2 illustrates the uplink and downlink substructures of an uplink bandwidth deholling process, according to some settings. Uplink substructures (UL) 202, 206, and 210 may correspond to uplink substructures 109 (FIG. 1) and downlink substructures (DL) 204 and 208 may correspond to downlink substructures 107 (FIG. 1).

In such configurations, base station 102 (FIG. 1) may receive orthogonal codes from subscriber stations 104 (FIG. 1) on uplink substructure 202 and may transmit orthogonal codes detected on downlink substructure 204 to indicate when a subscriber station may transmit a bandwidth request for uplink on the deeplink substructure 206. Base station 102 (FIG. 1) may offer bandwidth allocations to subscriber stations on dedownlink substructure 208 and subscriber stations 104 (FIG. 1) may transmit uplink during a portion of the darplink substructure 210 as indicated by base station 102 (FIG. 1) in downlink substructure 208. As described in more detail below, base station 102 (FIG. 1) uses SDMA techniques to detect signals received by radio stations. subscribers in conflict with uplink substructures 202. Base station 102 (FIG.1) can also use SDMA techniques to decode messages. uplink bandwidth deholling signals received simultaneously on the uplink substructure 206.

FIG. 3 illustrates tiles of a bandwidth-contention channel according to some configurations. In these configurations, the subscriber stations 104 (FIG. 1) may transmit orthogonal sequences in two or more blocks 302 during the uplink substructure 202 (FIG. 2). Each of blocks 302 may include a bandwidth request containment channel time-frequency block. The two or more tiles used by a specific subscriber station may include different frequency sub-carrier sets as shown. Base station 102 (FIG. 1) may detect one or more subscriber stations 104 (FIG. 1) by applying each of several orthogonal sequences to the received orthogonal sequences. At these configurations, base station 102 (FIG. 1) receives the orthogonal sequences from subscriber stations 104 (FIG. 1) by antennas 103 (FIG. 1) and uses an SDMA technique to help differentiate two or more orthogonal sequences that may have entered. in conflict. In these configurations, subscriber stations 104 (FIG. 1) may transmit orthogonal sequences on two or more orthogonal frequency tiles 302 by the bandwidth contention channel during the douplink substructure 202 (FIG. 2).

As illustrated in FIG. 3, the orthogonal sequence transmitted on each orthogonal tile 302 is transmitted by a subscriber station on different frequency carriers. In the example of FIG. 3, the first three bits of the orthogonal sequence can be transmitted in one subcarrier, the next three bits can be transmitted in another subcarrier, etc. Although 302 tiles are illustrated for transmission of only twelve bits, the overall sequences usually include many more bits.

FIG. 4 illustrates disjoint pilot patterns, according to some configurations. In some embodiments, base station 102 (FIG. 1) may transmit programming on downlink structure 204 (FIG. 2) that includes detected trunk codes and assignment of one of several disjoint pilot patterns 400 to each detected subscriber station 104 ( Fig. 1). Each disjoint pilot pattern 400 may be used for subsequent transmission by a detected subscriber station104 (FIG. 1) of a bandwidth request message to an uplink substructure 206 (FIG. 2). Pilot-disjoint patterns 400 may include orthogonal pilot subcarriers 402 (i.e. non-overlapping) and nonortogonal data subcarriers 404 (i.e. overlapping). Therefore, a disjoint pilot pattern carrier 402A 400A may have a null subcarrier 406 in a corresponding location of the disjoint pilot pattern 400B and each disjoint pilot pattern subcarrier 402 may have a null subcarrier 406 and a corresponding disjoint pilot pattern location 400Δ.

In this way, orthogonal sequences transmitted on pilot carriers 402 of one or more disjoint pilot patterns400 can be used to help determine channel response to the transmitting subscriber station as well as to help identify the subscriber station. Thus, the use of SDMA processing techniques by base station 102 (FIG. 1) allows subscriber stations 104 (FIG. 1) to send uplink bandwidth requests simultaneously using data carriers at the same frequency.

In some embodiments, at least one of subscriber stations 104 (FIG. 1) uses nonortogonal data subcarriers 404 for transmitting uplink bandwidth request messages to the next uplink substructure 206 (FIG. 2). Base station 102 (FIG. 1) may receive bandwidth de-solicitation messages on the next uplink206 substructure (FIG. 2) from two or more of the subscriber stations that may use SDMA techniques to separate bandwidth request messages. Uplink messages sent by the two or more subscriber stations 104 (FIG. 1) on the same data subcarriers 404. In these configurations, uplink bandwidth request messages may be sent using different disjoint pilot patterns400. Although FIG. 4 illustrates only two disjoint pilot patterns 400, configurations may use more than the two disjoint pilot patterns illustrated.

In some configurations, each subscriber station 104 (FIG. 1) may transmit an orthogonal sequence on the uplink substructure 202 (FIG. 2) and may transmit an uplink bandwidth request message on an uplink substructure 206 (FIG. 2) using an antenna 105 (FIG. 1), although isometry is not a necessity. Base station 102 (FIG. 1), in turn, receives daplink bandwidth request messages with two or more antennas 103 (FIG. 1) so that SDMA techniques can be used. Referring to FIGs. 1 - 4, in some configurations, orthogonal sequences may be randomly selected by subscriber stations 104 before being transmitted on uplink substructure 202. In these configurations, subscriber stations 104 transmit randomly selected orthogonal sequences in two or more tiles 302 during uplink substructure 202 to initiate the uplink bandwidth request. In these configurations, the subscriber stations 104 may no longer transmit non-orthogonal codes or partially orthogonal codes, such as code-division multiple access (CDMA) codes, to base station 102 by the wide-bollow containment channel. to initiate an uplink bandwidth request. In a conventional WiMax network, subscriber station bandwidth assertions include non-orthogonal codes or partially orthogonal codes, such as CDMA codes, modulated into a significant subcarrier portion of an OFDM symbol.

In these configurations, each subscriber station104 may select one or more non-overlapping tiles 302 for transmission of an orthogonal sequence in the bandwidth request containing channel. Tiles can be randomly selected and one subscriber station104 may end up selecting blocks that partially overlap partially with the blocks selected by other subscriber stations. The use of SDMA skin base station 102 techniques assists in the detection of different orthogonal codes.

Since the use of SDMA increases the channel bandwidth for requests, the conflict rate and delay are reduced. The use of SDMA also magnifies the transmission rate of the network using augmented space channels, which are formed by 105 of subscriber stations 104 and 103 base station antennas 102. According to some configurations, SDMA, when used for bandwidth requests allows simultaneous transmission by two or more subscriber stations104. In contrast, when there is a conflict in conventional bandwidth deholling schemes, none of the subscriber stations are detected.

In a conventional bandwidth request scheme, CDMA codes are used to help differentiate subscriber stations. According to some settings, these CDMA codes are replaced by a set of orthogonal sequences for i = 1, ..., M, where:

<formula> formula see original document page 10 </formula>

Any frequency deviation can be corrected using a common downlink or preamble pilot and the time deviation is bound by periodic ranging. In addition, the orthogonal sequence can be sent in multiple tiles 302. Cadlock 302 is a time-frequency resource block and can include underlying time and frequency subcarriers. The orthogonal consequence transmitted in each of the 302 tiles may be the same, although different sequences may be used.

The channel response throughout the tile 302 varies little and is treated with a constant in that block.

In some configurations, each subscriber station 104 randomly selects one of a series M-streams and transmits the selected sequence on the bandwidth request channel that is formed by tiles 302. In some configuration examples, base station 102 may use four receive antennas 103 to receive sequences from two subscriber stations 104 and each use a transmit antenna 105. The signal received in the tile may be modeled as

<formula> formula see original document page 10 </formula>

where '<> ·' <w represents the signal received at the tuned base station a in time '; ^ aw represents the channel response from subscriber transmission antenna ^ a to base station antenna 1a and is assumed to be a constant in the block, represents the orthogonal sequence sent by subscriber i; and <■ "represents additive white Gaussian noise (AWGN) at base station antenna l" at time l '. The two transmitted sequences can be detected according to:

<formula> formula see original document page 11 </formula>

where ^^^^. The original channel may be treated as the transmitted data and the original data β as the channel carrying the virtual data '. All possible sequences Bs can be compared to match the received signals ν>. The most compatible sequence can be selected.

<formula> formula see original document page 11 </formula>

The noise term ^ N ^ NW is not amplified in equation (2) because B consists of unit vectors. In addition, equation (2) can be used to detect subscriber stations 104 even when two subscriber stations 104 transmit the same sequences, so using SDiyLA can differentiate the two subscriber stations 104 based on the difference in their spatial channels.

After subscriber stations 104 are detected, base station 102 can schedule actual sending of the bandwidth request and transmit the programming on downlink substrate 204. The bandwidth request sent by subscriber stations 104 on the uplink206 substructure can be sent using SDMA. In these configurations, SDMA processing techniques are extended for bandwidth requests and base station 102 may allocate time-frequency subchannels to two or more detected subscriber stations 104 to transmit on the same subchannels and may assign two disjoint pilot patterns 400A and 400B to the same. two detected subscriber stations 104, so that base station 102 can estimate the channel responses of each of the two subscriber stations 104. In these configurations, base stations 102 can assign one of the disjoint pilot patterns 400 to the two detected subscriber stations 104. two detected subscriber stations 104 can send their bandwidth requests over the same subchannels in the uplink206 substructure.

FIG. 5 illustrates the uplink and downlink substructures of a uplink bandwidth deholling process, according to some alternative settings. The uplink substructures (UL) 506 and 510 may correspond to the uplink substructures 109 (FIG. 1) and the downlink (DL) substructure 508 may correspond to a downlink substructures 107 (FIG. 1).

In these configurations, uplink bandwidth request messages can be received on the bandwidth request contention channel of one or more subscriber stations 104 (FIG. 1) on the uplink substructure 506. Bandwidth request messages Uplink signals can be generated by subscriber stations 104 (FIG. 1) by pilot subcarrier demodulation of a randomly selected pilot-disjoint pattern 400 (FIG. 4) with a randomly selected orthogonal sequence. Uplink bandwidth allocations may be provided to subscriber stations104 (FIG. 1) on downlink substructure 508, when uplink bandwidth request messages are detected and decoded. In some configurations, the first three steps of the uplink bandwidth request process of FIG. 2 are combined and therefore bandwidth can be allocated faster, with lower bandwidth consumption and reduced latency.

In these configurations, base station 102 (FIG. 1) may receive dual bandwidth request messages via two or more antennas 103 (FIG. 1) and may apply SDMA techniques for determining channel responses with only orthogonal sequences. , to detect and decode uplink bandwidth request messages. At these settings, the douplink bandwidth request messages can be received on the bandwidth request containment channel in the uplink 506 substructure.

In these configurations, subscriber stations104 (FIG. 1) can randomly select a variety of disjoint pilot patterns, such as one of disjoint pilot patterns400 (FIG. 4) and one of several orthogonal sequences before transmitting the douplink bandwidth request messages. . Data subcarriers 404 (FIG. 4) may be modulated by subscriber stations 104 (FIG. 1) with an uplink bandwidth deholling data element. In these configurations, the base station 102 (FIG. 1) can determine the channel response to each subscriber station 104 (FIG. 1) by applying each orthogonal sequence of the various signals received on the disjoint pilot pattern pilot carriers 400 (FIG. 4).

With reference to FIGs. 1 and 3 - 5, in some configurations, when a single douplink bandwidth request is received from a subscriber station 104 on the uplink substrate 506, the base station 102 can detect the uplink bandwidth request by maximum matching. maximum ratio combining (MRC) and can allocate uplink bandwidth for uplink data transmission on the next downlink substructure 508 to a detected subscriber station.

When two conflicting douplink bandwidth requests received from two subscriber stations 104by the bandwidth request contention channel and two subscriber stations have randomly selected different disjoint pilot patterns and different time sequences, base station 102 may detect and decode the data. uplink bandwidth requests using a spatial demultiplexing technique. Base station 102 may indicate an uplink bandwidth allocation for uplink data transmission to each of the stations. detected subscribers 104 in the next downlink substructure 508.

Therefore, in these configurations, uplink bandwidth can be allocated in a two-step process, unlike conventional processes using CDMA codes, which require four or more steps. In such configurations, the spatial multi-multiplexing technique may include a minimum mean square error (MMSE) estimation technique or a zero-forcing technique, although the scope of the configurations is not limited in this regard.

In some configurations, when the conflicting uplink bandwidth requests are received from two base stations by the bandwidth de-contention containment channel and when two subscribing stations have randomly selected the same disjoint pilot patterns and different orthogonal sequences, the base station 102 you can try to detect and decode at least one uplink bandwidth request (eg, which had the highest error rate) using a spatial demultiplexing technique (eg, MMSE or zero-force). Base station 102 may also allocate uplink bandwidth for uplink data transmission to at least one of the subscriber stations when at least one subscriber station is successfully detected. In these configurations, conflicting uplink bandwidth request messages may be received at the bandwidth request contention channel on the uplink 506 substructure.

In some configurations, when the conflicting uplink bandwidth requests are received from two subscriber stations 104 on the bandwidth request channel and when the two subscriber stations 104 have selected the same pilot-pattern and orthogonal sequence, base station 102 may no longer allocate bandwidth for uplink data transmission to either of the two subscriber stations 104 when uplink bandwidth requests cannot be detected and / or decoded. In these configurations, base station 102 may not be able to detect any uplink bandwidth requests received on the bandwidth request contention channel in the deuplink substructure 506, since both subscriber stations 104 have selected the same disjoint pilot patterns and the same orthogonal consequences. Thus, base station 102 is not able to provide a bandwidth allocation on the next downlink frame 508. In addition, since none of the subscriber stations 104 were detected, base station 102 is not able to transmit a detected sequence to allocate. a transmission resource to a subscriber station 104 for sending a contentionless uplink bandwidth request, as in the uplink bandwidth request process of FIG. 2.

In some configurations, subscriber stations 104 may randomly select one or two disjoint pilot patterns 400 and one between two orthogonal sequences for transmitting douplink bandwidth request messages. When more than two conflicting douplink bandwidth requests are received from more than two subscriber stations 104 through the bandwidth request contention channel, base station 102 may attempt to detect one or more orthogonal sequences and pilot patterns to detect one or more subscriber stations 104. Base station 102 may also transmit on a downlink substructure, such as downlink substructure 204 (FIG. 2), one or more detected gate sequences and pilot patterns to allocate a relay resource to each subscriber station 104 detected. The transmission resource should be used by the detecting subscriber stations 104 to relay a bandwidth request message without contention. In these configurations, base station 102 may be capable of detecting only one or more subscriber stations 104, but will probably not be able to decode the uplink bandwidth request messages. Therefore, detected subscriber stations 104 may be allocated to a transmission resource to relay an uplink bandwidth request on the next uplink substructure.

In some embodiments, each subscriber station 104 may include PHY layer circuits and signal processing circuits for performing the operations described herein. In these configurations, signal processing circuits may randomly select one of the disjoint pilot patterns 400 and one of the orthogonal sequences. PHY layer circuits may be configured to transmit an uplink bandwidth request message on the bandwidth request contention channel. PHY layer circuits can generate uplink bandwidth request messages by modulating pilot subcarriers of the randomly selected disjoint pilot pattern 400 with the randomly selected orthogonal sequence.

Although base station 102 is illustrated as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements, including digital signal processors (DSPs) and / or other hardware elements. For example, some elements may include one or more microprocessors, DSPs, application specific integrated circuits (ASICs), radio frequency integrated circuits (RFICs), and various hardware combinations and logic circuits to at least perform the functions here. described. In some embodiments, the base station functional elements 102 may refer to one or more processes operating on one or more processing elements.

Unless specifically stated otherwise, terms such as processing, computation, calculation, determination, display, or the like may refer to an action and / or process of one or more processing or computing systems, or similar devices, that may manipulate and transform represented data. as physical quantities (eg, electronic) contained in the records and memories of processing systems in other data similarly represented as physical quantities in the records or memories of the processing system, or others such as information storage, transmission or display devices. In addition, as used herein, a computing device includes one or more processing elements combined with computer readable memory, which may be volatile or nonvolatile, or a combination.

Configurations can be implemented in one or a combination of hardware, firmware and software. Configurations may also be implemented as instructions stored on computer-readable media that can be read and performed by at least one processor to perform written operations. Computer-readable media may include some mechanism for storing or transmitting information in machine-readable format (eg, a computer). As an example, computer readable media may include read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, and others. .

Summary is provided in compliance with regulations 37 C.F.R. Section 1.72 (b) which requires a summary allowing the reader to determine the nature and basis of the technical disclosure. It is sent with the understanding that it will not be used to limit or interpret the scope or meaning of the claims. The following claims are incorporated herein in the detailed description and each claim stands out as an independent configuration.

Claims (26)

1. Bandwidth allocation process characterized by: receiving, through a bandwidth-free containment channel, orthogonal sequences sent in two or more subscriber station blocks, each of which two or more blocks include a time-block. frequency; detect one or more subscriber stations by applying each of several orthogonal sequences to the received orthogonal sequences, in which a base station receives the subscriber station orthogonal sequences via multiple antennas and uses a space division multiple access (SDMA) technique. ) to help differentiate two or more of the conflicting stem sequences. Method according to Claim 1, characterized in that the orthogonal sequences are sent by the subscriber stations during the doublink substructure and the transmission in a downlink substructure of orthogonal codes corresponding to the detected subscriber stations and the assignment of a between several disjoint pilot patterns for each detected subscriber station, each disjoint pilot pattern for subsequent transmission by a detected subscriber station of an uplink bandwidth request message on a next uplink substructure. Process according to claim 2, characterized in that the disjoint pilot patterns include orthogonal pilot carriers and nonortogonal data carriers. Process according to claim 3, characterized in that at least some of the subscriber stations use non-orthogonal data subcarriers for transmitting douplink bandwidth request messages to the next uplink substructure and additionally receiving uplink bandwidth request messages on the next uplink substructure of two or more subscriber stations; and additionally use SDMA techniques to separate uplink bandwidth request messages sent from two or more subscriber stations. Method according to Claim 4, characterized in that the detected subscriber stations transmit their uplink bandwidth request messages using one or more antennas and, in addition, the base station receives the bandwidth request messages. uplink with two or more antennas. Process according to claim 1, characterized in that the orthogonal sequences are randomly selected by the subscriber stations and the subscriber stations transmit the randomly selected orthogonal sequences in two or more blocks during the uplink substructure for bandwidth request. douplink and, additionally, each of the blocks may include a bandwidth request containment channel time-frequency block. Method according to claim 1, characterized in that the subscriber stations allow the transmission of code division multiple access (CDMA) codes to the base station over the bandwidth request contention channel to request bandwidth. Uplink band. 8. Device characterized by a base station for allocating bandwidth to subscriber stations, with base station including: physical layer circuits for receiving, by means of two or more antennas, in bandwidth request contention channel, orthogonal sequences sent at two or more subscriber station blocks, each of the two or more blocks comprising a time-frequency block; It is a signal processing circuit to detect one or more subscriber stations by applying each of several orthogonal sequences to the received orthogonal sequences, in which the signal processing circuit uses a space division multiple access (SDMA) technique to help differentiate two or more conflicting sequence sequences. Device according to claim 8, characterized in that it has a base station in which the orthogonal sequences are sent by the subscriber stations during the uplink substructure and, in addition, in which the base station's physical layered circuits are configured to transmit , in a downlink substructure, orthogonal codes corresponding to the detected subscriber stations and the assignment of a disjoint pilot pattern interview to each detected subscriber station, each disjoint pilot pattern for subsequent transmission by a subscriber station detected from an uplink bandwidth request message on an upcoming uplink substructure. Device according to Claim 9, characterized in that it has a base station, in which the pilot patterns included include orthogonal pilot subcarriers and non-orthogonal data subcarriers. A method for allocating uplink bandwidth using the space division multiple access (SDMA) technique, including: receiving uplink bandwidth request messages on a bandwidth request contention channel from one or more broadcasting stations. subscriber, uplink bandwidth deholling messages being generated by subscriber stations by modulating sub-carriers from a randomly selected disjoint pilot pattern, with a randomly selected orthogonal sequence, providing uplink bandwidth allocations to subscriber stations when uplink bandwidth request messages are successfully detected and decoded; and apply SDMA techniques for determining channel responses, based on orthogonal sequences, to detect and decode the bandwidth request messages from the link. Method according to claim 11, characterized in that it receives by a base station the bandwidth request messages by means of two or more antennas. Method according to claim 12, characterized in that the subscriber stations randomly select one from several pilot patterns to break one from several orthogonal sequences before transmitting the uplink bandwidth request messages and additionally in which subcarriers of bandwidth request contention channels are modulated by subscriber stations with an uplink bandwidth request data element. Method according to claim 13, characterized in that it is performed by a wireless broadband access network base station, which communicates with subscriber stations using frequency division multiple access downlink substructures. (OFDMA) and additionally includes determining the channel responses by applying one of several orthogonal sequences to the pilot sub-support signals received from the disjoint pilot bandwidth-contention channel patterns. A method according to claim 13, characterized in that a single uplink bandwidth request is received from a subscriber station additionally: detecting the douplink bandwidth request by combining maximum ratio; and relocate uplink bandwidth on an upcoming downlink framework for uplink data transmission to the detected subscriber station. A method according to claim 15, wherein when two conflicting uplink bandwidth requests are received from two subscriber stations by a bandwidth request contention channel when the two subscriber stations has randomly selected different disjoint pilot patterns and different orthogonal sequences, detects and decodes uplink bandwidth requests using a spatial demultiplexing technique; and allocates uplink bandwidth for uplink data transmission to each of the subscribing stations on a near downlink substructure. A method according to claim 16, characterized in that the spatial demultiplexing technique includes a least-square quadrature error estimation (MMSE) technique or a zero-forcing technique. A method according to claim 16, wherein when two conflicting uplink bandwidth requests are received from two subscriber stations by a bandwidth request contention channel when the two subscriber stations has randomly selected disjoint pilot patterns equal to different orthogonal sequences, attempts to detect and decode at least one uplink bandwidth request by a spatial demultiplexing technique; allocates uplink bandwidth for uplink data transmission to at least one of the subscriber stations when at least one subscriber station is successfully detected. A method according to claim 16, wherein, when two conflicting bandwidth requests are received from two subscriber stations by a bandwidth request contention channel, when the two subscriber stations have randomly selected equal disjoint pilot patterns and equal orthogonal sequences no longer allocate bandwidth for uplink data transmission to either of the two subscriber stations when uplink bandwidth requests cannot be detected and decoded. Method according to claim 16, characterized in that several subscriber stations randomly select one or two disjoint pilot patterns or between two orthogonal sequences for transmitting uplink bandwidth request messages and additionally when more two conflicting bandwidth uplink requests are received from more than two subscriber stations through the bandwidth request contention channel, attempts to detect one or more orthogonal sequences and pilot patterns to detect one or more subscriber stations; If it transmits one or more detected orthogonal sequences and pilot patterns to allocate a transmission resource to each detected subscriber station, the transmission resource to be used by the detected subscriber station to relay a contentionless bandwidth request message. Method for requesting uplink bandwidth allocation by subscriber stations, characterized in that it randomly deselects one or more disjoint pilot patterns and one or more orthogonal sequences; and transmit uplink bandwidth request messages on a bandwidth request containment channel, with the douplink bandwidth request messages being generated by subscriber stations by demodulating randomly selected disjoint pilot pattern subcarriers with a randomly selected orthogonal sequence, and, in addition, uplink bandwidth allocations are provided to subscriber stations when uplink bandwidth bounce messages are detected and successfully decoded by a receiving base station. Method according to claim 21, characterized in that the base station receives the uplink bandwidth request messages via two or more antennas and applies space division multiple access (SDMA) techniques for determining Channel responses based on orthogonal sequences to detect and decode uplink bandwidth bounce messages. Method according to claim 22, characterized in that the modulation of subcarriers of the common bandwidth request contention channel data uplink bandwidth request data element. Device, characterized in that a base station allocates bandwidth for subscriber stations as a base station including: physical layer circuits for receiving, by two or more antennas, on a bandwidth request contention channel , uplink bandwidth request messages on a bandwidth request contention channel through one or more subscriber stations, uplink bandwidth request messages being generated by subscriber stations via subcarrier modulation of a pattern randomly selected disjoint pilot with a randomly selected orthogonal sequence; Signal processing circuits determine uplink bandwidth allocations for subscriber stations when uplink bandwidth request messages are successfully detected and decoded, and additionally signal processing circuits apply split-division multiple access techniques. (SDMA) space to determine channel responses, based on orthogonal sequences, to detect and decode uplink bandwidth request messages. Device according to claim 24, characterized in that it has a base station in which the physical layer circuit receives the uplink bandwidth request messages by means of two or more antennas, in which the subscriber stations randomly select one. between several disjoint pilot patterns and one between several orthogonal sequences before transmitting the messages. uplink bandwidth request sub band where sub-carriers of bandwidth request contention channels are modulated by subscriber stations with a request data element uplink bandwidth. Device according to Claim 25, characterized in that it has a base station, in which the base station is a wireless broadband access network base station, which communicates with the subscriber stations using access-link subframe structures. Orthogonal Frequency Division Multiple (OFDMA) where the signal processing circuit is configured to determine channel responses by applying each of the various orthogonal sequences to the pilot sub-bracket signals received from the disjoint pilot bandwidth-contention channel patterns.