Scheduling with reverse direction transmission grant in wireless communication systems. RU patent 2521594.

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to wireless communication engineering and can be used to grant reverse direction transmission. The method of scheduling with reverse direction transmission grant comprises receiving, in a receiver from a transmitter, a multi-poll frame that schedules transmissions for a number of time periods associated with transmission opportunities; transmitting data in a first direction from the receiver to said transmitter according to the multi-poll frame, wherein data transmission is terminated before the end of a specific period from the scheduled time periods; transmitting a reverse direction transmission grant from the receiver to said transmitter, wherein the reverse direction transmission grant allows the transmitter to transmit data in a second direction to the receiver using a specific period from the scheduled time periods associated with a specific transmission opportunity; and receiving, in the receiver, data transmitted in a second direction from said transmitter, which schedules transmissions during a specific time period from the scheduled time periods associated with a specific transmission opportunity.

EFFECT: high efficiency of using communication channel bandwidth when communicating with scheduled time periods which grant specific stations access to the channel.

20 cl, 13 dwg

The technical field to which the invention relates

The following discussion generally applies to wireless, and more precisely to the use permits transmission in the opposite direction in the system of wireless communication.

The level of technology

Wireless communication systems are widely used to provide different types of communication, for example, through such systems wireless communications may be capable of transmitting speech and/or data transfer. Typical wireless information system, or network that provides access multiple users to one or more shared resources. The system can use a variety of multiple access technologies, such as multiplexing frequency division multiplexing (FDM), multiplexing with time division multiplexing (TDM), multiplexing code division multiplexing (CDM) and others.

Examples of wireless systems, which allow various types of links include wireless local area networks (WLAN), such as WLAN, who report one or more of the IEEE 802.11 standards (Institute of electrical and electronics engineers) (for example, 802.11 (a), (b) or (g)). Additionally, was introduced IEEE 802.11(e) to correct some of the shortcomings of previous 802.11 standards. For example, 802.11(e) can improve the quality of service.

Traditional wireless systems that use technology to provide access to the channel, can provide an opportunity for specific station (for example, the access point, base station, user terminals, mobile terminal,...) to send data in a given period of time. However, such appointment may result in inefficient use of the channel, when the station has completed its associative associated transmission before the end of the selected period of time transmission. Thus, in the art there is a need in the system and/or generalized ways to improve efficiency in such plan wireless systems.

SUMMARY OF THE INVENTION

Subsequent represents a simplified summary of one or several variants of implementation to ensure a basic understanding of such ways. This summary is not a broad overview of all of the proposed options for implementing and is neither intended to identify key or critical elements of all variants of implementation, nor for delineating the scope of some or all variants of implementation. Its only aim is to present some ideas of one or several options for the implementation of simplified, as the entry into more detailed description of which is presented later.

In accordance with one or several variants of implementation and relevant to their erections, various aspects described in connection with a reduction in waste of bandwidth communication channel in connection with the planned time periods which give access to the channel-specific stations. According to various aspects, described systems and methods that contribute to the provision and/or use permits transmission in the opposite direction, with the planned channel access. Such systems and/or methods can reduce the number of unnecessary time channel after the station has completed the transfer of data to the end of the selected period.

According to related aspects way wireless communication may contain stages, which take multiple frame survey, which plans to send for a certain number of time periods are associated with the possibilities of transfer, transmit data during a specific period of the planned periods of time, associative knitted with specific transmission in the first direction according to multiple frame survey, passed a resolution transmission in the opposite direction during a specific scheduled time period, associative associated with specific transmission in the first direction, and the transfer resolution in the opposite direction gives the recipient the ability to transmit data and receive data passed in the second direction during a specific scheduled time period, associative associated with a particular transmission. How, moreover, can contain phases in which evaluate whether to pass a resolution transmission in the opposite direction, determine the amount of time remaining in particular the planned period of time, associative associated with a particular transmission, and/or determine completed if the station is indicated as being a transmitter in multiple frame survey, associative associated transmission. How can optionally contain the time that evaluate whether to use the adopted resolution transmission in the opposite direction for at least part of the remainder specific scheduled time period, associative associated with a particular transmission, evaluate at least one of the following: the amount of time remaining in particular the planned period of time, and the amount of data that must be passed in the second direction when you access a channel, and/or generate multiple frame survey, which is the frame that specifies, for each of the mentioned periods of time, information, associative associated with relevant, appropriate transfer capability, and information includes at least one of the following: identity of a transmitting station, the identity of the receiving station, the starting time and duration.

Another aspect relates to the device, which promotes the use permits transmission in the opposite direction in the system of wireless communication, which may include memory that stores information, associative associated with the plan relevant to the access to the channel; and the processor is attached to the memory that is configured with the possibility of transmission transmission solutions in the reverse direction during transmission capabilities assigned to the device, according to information on the basis of information that must be transferred from the device. The processor can be configured to use the ID of the access channel to determine the amount of time that the device performs at least one of the following: a reception or transmission of data, the use of the ID channel access synchronization of the device with at least one other device, and/or use of the ID of the access channel to operate in standby mode for periods of time that the device is not identified as being at least one of the following: a receiver or transmitter. The processor can be further configured to use the adopted resolution transmission in the opposite direction and change the device to receive data during the current transfer data during the current transfer capabilities, and/or determine whether to use the transfer resolution in the opposite direction to change the device to receive data data transmission, based at least in part, one or more of the following: the amount of time remaining in the current transfer capabilities, and the amount of data that must be transmitted by the device. The processor can also be configured to grant permits transmission in the opposite direction when the device completes the transfer during the transfer before the end of the selected duration, and/or determine whether to pass a resolution transmission in the opposite direction, based at least partially, the amount of time remaining in the transmission capabilities.

One other aspect refers to the machine-readable medium of information, containing the stored machine-executable commands for data transfer capabilities in the first direction according to the plan for channel access, assess whether to pass a resolution transmission in the opposite direction of transmission transmission solutions in the opposite direction to the recipient in the first direction during the ability to send and receive data from the receiver permits transmission in the opposite direction in the second direction during transmission capabilities. Machine-readable medium information can optionally contain commands to use standby mode during the transfer, which gives access to the channel unequal devices and commands for planning a number of opportunities to transfer through the formation of multiple frame survey, which includes a frame that contains the data associative associated with at least one of the following: with the transmitter, receiver, with a start time and duration, associated with the corresponding transmission for each of the many periods time. Additionally, machine-readable medium of information may contain commands for planning a number of opportunities to transfer by means of formation the order in which the token is sent, and/or team to identify that associative associated station specified by the plan as of the transmitter.

To address these and related tasks, one or several options of implementation contains characteristics that are fully described in further and specifically mentioned in the claims. The subsequent description and the accompanying drawings recount some illustrative aspects of one or several variants of implementation. These aspects are, however, indicate only some of the different ways in which you can apply the principles of different variants of implementation, and describes the options for implementation are designed to cover all these aspects and cash equivalents.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 - illustration of wireless communication systems in accordance with various aspects contained in the materials of this application.

Figure 2 - illustration of the system, which applies the permissions transmission in the opposite direction, with the planned intervals to access the channel in accordance with various aspects.

Figure 3 illustration of multiple survey that can be used for planning of the access channel.

Figure 4 illustrates the example that demonstrates the use of the planned periods access (SCAP) inequitable technologies for access to the channel.

Figure 5 - example of a frame SCHED (planning) in accordance with various aspects.

6 illustrates an example of a message SCHED in accordance with various aspects.

7 - example of SCAP, where planning is used with the permission of transmission in the opposite direction, in accordance with various aspects.

Fig illustrates a generic way to use the permits transmission in the opposite direction within the allocated time period for the implementation of the access channel to promote the reduction of the wasted bandwidth in wireless systems, in accordance with one or more aspects.

Figure 9 illustrates a generic way to allow transmission in the opposite direction, with the planned access to the communication channel according to many aspects described in the materials of this application.

Figure 10 illustrates a generic way to apply permissions transmission in the opposite direction, with the planned periods of access to the channel in accordance with various aspects.

11 - illustration-user devices, which contributes to the development and/or use permits transmission in the opposite direction, with the planned periods of channel access, in accordance with one or more aspects contained in the materials of this application.

Fig - illustration of a system that facilitates the planning of channel access and/or use permits transmission in the opposite direction to reduce the waste of bandwidth in wireless systems, in accordance with various aspects.

Fig - illustration wireless network environment that can be used in conjunction with a variety of systems and methods described in the materials of this application.

DETAILED DESCRIPTION

Moreover, different aspects or characteristics described in the materials of this application can be implemented as a method, device, or product using standard technologies of programming and/or design. The term "product", as used in the materials of this application, means covering a computer program, accessible from any machine-readable device, media or environment. For example, a machine-readable form may include, but not as a limitation, magnetic storage device (e.g. hard disk, floppy disk, magnetic stripes...), optical disks (for example, the compact disc (CD), digital multifunctional DVD...), smart card and flash memory devices (for example, EPROM (erasable programmable permanent storage device, EPROM), card, memory card, push button management body...). Additionally, different storage media, described in the materials of this application, can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium of information" may include, without limitation, wireless channels, and various other media, capable of preservation, retention and/or the transfer of commands(teams) and/or data.

Traditional fully planned wireless communication systems with time division of channels can be associatively linked to wasteful use of the communication channel. For example, a particular station may be authorised to transmit data over a specific period of time over the communication channel. However, when the station has completed the transfer before the end of the selected period, resources, associative associated with the channel, are spent in vain, because unequal stations are typically not given the opportunity to access the channel to transfer data during this period. Thus, it is desirable to facilitate the provision of permits transmission in the opposite direction (RDG) in connection with the planned periods of access to the channel in order to reduce a waste of a communication channel. The transfer resolution in the opposite direction can be used by the receiving station for access to the channel during the remaining period.

Further, with reference to figure 1, illustrates the system is 100 wireless in accordance with various aspects contained in the materials of this application. System 100 includes point 104 of access (AP), which with the possibility of communication attached to one or more user terminal (UT) 106A-N, where N can be any positive integer. In accordance with the terminology 802.11 AP 104 and UT 106A-N also mentioned as the station or STA in the materials of this application. AP 104 and UT 106A-N communicate via

a wireless LAN (WLAN) 120. According to one or more aspects, WLAN 120 is a high speed OFDM system (multiplexing orthogonal frequency division multiplexing) with MIMO (multiple input multiple many outputs); however, WLAN 120 can be any of the wireless LAN. Point 104 of access supports communication with any number of external devices or processes through a network of 102. The 102 network can be the Internet, intranet (local area network that uses the technology of the Internet) or any other wired, wireless or fiber optic network. Connection 110 carries signals from the network 102 in point 104 of access. Devices and processes can join the network 102 or UT 106A-N (or in connection with them) on the WLAN 120. Examples of devices that can be connected to the network 102 or WLAN 120, include telephones, personal digital assistants (PDAs), different types of computers (road computers, personal computers, workstations, terminals of any type), audiovisual devices, such as HDTV (TV with high resolution), DVD player, wireless speakers, digital cameras and video camera recorders, network video cameras and virtually any other type of information devices. Processes may include voice, video, data, etc.

Different data flows can have a changing technical requirements for the transfer, which can be ensured through the use of technology changes in the quality of service (QoS).

System 100 can be used with a centralized AP 104. All UT 106A-N can communicate with the AP 104 according to the example. Additionally or alternatively, two or more of the UT 106A-N can communicate through direct peer-to-peer communications (for example, using the straight line settings of the connection (DLS), associative associated with 802.11(e)). Access can be controlled AP 104 and/or may be accidental (such as those based on competition).

In accordance with the various aspects of the transfer resolution in the opposite direction may be used in connection with the wireless communication system, such as system 100. Allow forwarding for the reverse connection lines can be used with the plan that allocates access to the channel for a certain number of time periods, each of the periods associated with specific stations (for example, AP 104, one of the UT 106A-N, and so on), which transmits data through the communication channel (e.g. WLAN 120) in particular the second station (for example, AP 104, one of the UT 106A-N, and so on).

The multiple frame survey can be used to determine the transmission to the relevant period of multiple survey. The planned transfer during the period of multiple survey may include transfer from the AP (for example, AP 104) on STA (for example, UT 106A-N), with the STA on the AP, and also with the STA to other STA. For example, multiple frame survey can be a frame SCHED that defines multiple descending line, multiple ascending line, and/or many transfer in a straight line STA STA can be provided for stations (for example, AP 104, one of the UT 106A-N, and so on).

Frame SCHED, thus, can be a single frame, which is planning a number of periods, or in this case, the frame SCHED can specify that the first station is a radio transmitter, the second station is the receiver, the starting time and duration for access to the channel for each of the planned periods. It is assumed that aspects of this disclosure is not limited to using the frame SCHED; for example, the planning can be implemented using multiple survey, United survey and/or token that is sent between stations in a coherent sequence. Accordingly, must be taken into account that any planning, associative associated with the channel access, falls under the scope of the aspects of this disclosure.

The station is identified as a transmitter, could stop the data transfer channel (for example, WLAN 120) before the end of the selected duration access to the channel. Accordingly, the transmitter can authorize the transfer in the opposite direction to the receiver, thus, giving the listener the ability to transmit data over the channel (for example, WLAN, 120). Receiver which receives the authorization of the transfer in the opposite direction, then can transmit data to the transmitter, for example, during the remaining duration. According to another illustration, the transmitter can authorize the transfer in the opposite direction on the AP 104, such as within the scheduled period for communication in a straight line STA STA (for example, UT 106A, scheduled for transfer, and UT 106, scheduled for admission). Thus, AP 104 can communicate with the transmitter (for example, UT 106A) through the channel (for example, WLAN 120) during the remaining period of time.

UT 106A-N and AP 104 can use synchronized clock generators to provide transmission and/or reception in their respective scheduled intervals in accordance with and/or generated by multiple frame survey (and/or frame SCHED, United survey marker sent under the plan,...). The multiple frame survey gives stations able to access the channel within the selected period of time and involves the amount of time during which the transmitting station can transmit data across the channel. The plan provides for notification to each STA transmitter related to the moments of time when the possibility of transfer (TXOP) begins and ends. Thus, the sending station can transfer any amount of data that is placed in the selected time interval. Additionally, the plan can also inform STA receiver when it is necessary to pass to the active state for the reception of traffic.

802.11e provides for the concept TXOP. Instead of access channel for the transmission of a single frame of data, STA given period of time, during which it provided the opportunity to use the channel for sending so many frames as fit within such period. TXOP reduces the technical signals or data associative related to access to the channel; for example, reduced waiting time and collision due to the enhanced distributed channel access (EDCA), and reduced service signals or survey data in relation to the managed by the HCF channel access (HCCA).

As an additional example, multiple frame survey may indicate that UT 106A is a radio transmitter in a while, associative associated with the first period of time (for example, the first survey), and AP 104 is a receiver in this period of time. UT 106A supplied TXOP in a selected time period. During the TXOP, UT 106A can transfer any amount of data to the AP 104. For example, UT 106A can pass any number of modules Protocol data of level MAC (MPDU), separated by a short interframe spacing (SIFS), AP 104. Additionally or alternatively, UT 106A can aggregate MDPU and delete SIFS who share MPDU, and, thus, to transmit the aggregated MPDU (A-MPDU). In addition, the request ACK (acknowledgement) of the block can be transmitted through UT 106A and/or can be aggregated as part of A-MPDU. If multiple frame survey generates a certain amount of time to UT 106A passed the data on the wire from the condition that additional period of time remained in TXOP, following the completion of a transfer UT 106A, UT 106A may pass a resolution transmission in the opposite direction on the AP 104. AP 104 can use the transfer resolution in the opposite direction for data transmission over the communication channel, for example, on UT 106A during the remaining time within TXOP. To receive the permission of the transfer in the opposite direction, AP 104 can estimate the time remaining in the selected period and/or the data stored in the buffer(s), associative associated with the AP 104 to pass. On the basis of at least part of this assessment, AP 104 can use and/or non-use of the transfer resolution in the opposite direction to transmit data across the channel. Should be taken into account that this example is for illustrative purposes only, and aspects of this disclosure are so limited.

In the materials of this application are disclosed indicative options for implementation, which support the effective work in connection with ultra high physical layers for wireless LAN (or similar applications that use emerging technologies transfer). Various approximate options for implementation retain the simplicity and stability of traditional WLAN systems, examples of which are found in 802.11(a-e). The advantages of the different variants of implementation can be achieved while maintaining backward compatibility with traditional systems. (Note that in the description below, the system 802.11 described as an example of traditional systems. It should be noted that one or more of the improvements discussed in the materials of this application, is also compatible with alternative systems and standards).

Referring to figure 2, illustrates the system 200, which applies the permissions transmission in the opposite direction, with the planned intervals to access the channel, in accordance with various aspects. The system 200 includes point 204 access (AP), the first user terminal (UT) 204 and second user terminal (UT) 206. Should be taken into account that the system 200 can include any number of additional AP and/or UT. AP 204 and UT 204-206 communicate via

a wireless LAN (WLAN) 208. AP 204 can put on UT 204-206 plan associative access to WLAN 208. For example, there may be multiple frame survey (for example, frame SCHED), can be predetermined sequence so that the token is sent between stations, etc.

According example, the plan may specify that during a specific time segment UT 204 is a radio transmitter and UT 206 is the receiver. Thus, UT 204 and UT 206 communicate via connection 210, which is associated with WLAN 208. If UT 204 completes the transfer of data to the end of the allocated time segment, which is provided for by the plan, UT 204 may pass a resolution transmission in the opposite direction at UT 206 through the connection 210. UT 206 can use the transfer resolution in the opposite direction for the transmission of data via WLAN 208. For example, UT 206 can transmit data at UT 204 and/or AP 202 during the remainder of the selected time segment. As an illustration, unequal UT other than UT 204 and UT 206 (not shown)can be found in the standby mode, during this specific time segment.

With reference to figure 3, shows the frame 300 multiple of the survey (for example, the United survey), which can be used for planning of the access channel. Frame 300 multiple of the survey can be provided according to 802.11n. Frame 300 multiple survey includes the header 310, which may contain data synchronization. Frame 300 multiple survey may also include a sequence of any number of surveys (for example, a survey of 1 320, a survey of 2 330, the survey N 340, where N is any positive integer). Each of the surveys (for example, the survey 1) may include data that identifies the station as a transmitter 350, identification data unequal station as a receiver 360, data indicating the initial moment 370 time, and the data that specifies the duration of 380.

During the interval of the beacon (e.g. signal 402 beacon), AP has the flexibility adaptive insert duration based on competitions EDCA access (for example, EDCA 404), controlled phase access (CAP), 802.11e (for example, CAP 406) and the scheduled period of access (SCAP) (for example, SCAP 408). EDCA 404 may include one or more TXOP 410 EDCA. During the TXOP 410 EDCA requesting STA may be permitted to send one or more frames. The maximum duration of each TXOP 410 EDCA depends on the class of traffic and can be set by the AP. STA can access the channel after the perception channel free for at least a certain amount of time, the relevant associative associated interframe spacing.

CAP 406, which can be associatively linked to HCCA, is a limited time period and may be formed by concatenating the sequence TXOP 412 HCCA. AP can be set free from the competition period (CEP)during which the AP can provide access to the serial poll related to associative STA. Free competitions survey (CF-poll)or the survey 414, is transmitted by the AP and accompanied by the transfer from the respondents STA. Configuring direct communication line (DLS), associative associated with 802.11e, STA provides the ability to forward frames directly to another STA destination using the basic service set (BSS). AP can create TXOP serial poll suitable for this live broadcast frames between the STA. Additionally, during access to the serial poll destination frames with respondents STA can be AP.

As an extension HCCA and EDCA can use the adaptive coordination (ACF), which provides flexible, high-performance, planned low-latency operation, suitable for high speeds involved physical layer (PHY) MIMO. Using message 416 SCHED as part of the SCAP 408, AP can plan one or more TXOP AP-STA STA-AP and the STA STA in the period known as the planned period of access (SCAP). The maximum permitted value SCAP may vary, according to the aspect, may be 4 MS. In accordance with another example, the maximum value of the SCAP can be 2,048 MS; however, aspects of this disclosure are so limited.

STA c MIMO submit to the border of the SCAP. Last STA, for transfer to the SCAP 408, completing his transfer not later than the end of its allocated TXOP. STA c MIMO subject to the borders of the planned TXOP and completed his transfer before the end of the appointed TXOP. This reduces the risk of collisions and provides the next scheduled STA opportunity to start your TXOP, not perceiving the channel is free.

AP can use the following procedure to recover from errors reception SCHED. If STA not be able to decode the message SCHED, it will not be able to use TXOP. If the planned TXOP does not start at the specified initial moment of time, the AP can initiate recovery by passing in PIFS after the beginning of unused planned TXOP. AP can use the period of unused planned TXOP as CAP. Over the CAP, the AP can transfer to one or more STA (for example, STA, which are converted to the active state) or poll STA, which missed scheduled TXOP, or other STA. CAP ends before the next scheduled TXOP. The same procedure can also be used when scheduled TXOP terminates prematurely. AP can initiate recovery by passing in PIFS after the end of the last pass into planned TXOP. AP can use the unused period of planned TXOP as CAP.

Referring to figure 5 illustrates an example of a frame 500 SCHED in accordance with various aspects. Message 500 SCHED can be transmitted as a separate module Protocol data physical (PHY) layer (PPDU) SCHED; however, aspects of this disclosure is not limited so. Header field 510 MAC frame 500 SCHED can be 15 octets in length; however, aspects of this disclosure are so limited. The presence and duration of segments CTRL0, CTRL1, and CTRL2 CTRL3 specified in the Signal PPDU SCHED. Transmission speed CTRL0 may or may not be less than the speed of transmission CTRL1, and so on. Hence, CTRL0 may signal STA who have poor radio connection with the AP, and may give the maximum transmission distance. Additionally, CTRL3 can be transmitted at high speed and minimize the time of transfer to alarm STA with a good radio connection with the AP. Bits 13-0 field 520 duration can set the length of the SCAP, for example, in microseconds. Box 520 duration is used STA allowing transmission OFDM MEMO to install vector network redundancy (NAV) on the duration of the SCAP. NAV can be used to define the duration of the period of time during which the channel is busy in the future. NAV can set the frame is ready to send (RTS) and/or clear to send (CTS). ID 530 basic service set (BSSID) can be the address of management of access to the transmission medium (MAC) stations and AP.

With reference figure 6, illustrates another example of the message 600 SCHED in accordance with various aspects. Message 600 SCHED determines the plan for SCAP. Each of the segments CTRL0, CTRL1, and CTRL2 CTRL3 have variable length and can be passed on 6, 12 and 24 Mbps, respectively. A number of elements 610 destination can be included in each segment CTRLJ. Each element 610 destination specifies the identity Association (AID) of the transmitter STA AID host STA, the initial moment of time scheduled TXOP and the maximum permitted duration of the scheduled TXOP. The inclusion of transmitting and receiving STA in the destination item enables effective energy conservation on the STA, which is not scheduled for transmission or reception during the SCAP. When traditional STA present in its BSS, the AP can use additional means of protection of SCAP, for example, traditional CTS himself. Message 600 SCHED additionally includes a sequence 620 control frame (FCS).

With reference figure 7 illustrates an example SCAP 700, where planning is used with the permission of transmission in the opposite direction, in accordance with various aspects. Transmission solutions in the reverse direction can be suitable for both access points and stations. Additionally, the transfer resolution in the opposite direction can be applied when direct communication line (DL) set between two stations. A number of transfers can be scheduled 702. For example, the transfer can be planned with the AP on STA (for example, appointment 704 with AT on STA B), with the STA on the AP (for example, appointment 706 with STA C on AP), with the STA on STA (for example, appointment 708 with STA D at E STA), etc.

Provided that the transmitter (for example, AP, STA) has completed the transfer of data during a TXOP with the length of time remaining in the TXOP (for example, Tx 710 with the AP on STA B), the transmitter can use the transfer resolution in the opposite direction (for example, RDG 712)to provide access to the channel unequal STA active during this interval. Thus, the STA transmits can pass RGD in the first direction on the receiving STA.

In response to RDG, station-the Respondent may be able to send traffic (for example, Tx 714 with STA B AP) in the second direction without forcing to execute arbitrary access to the channel. Thus, the probability of a collision with another STA connecting to the channel at the same time, reduced, provided that all other STA was decoding frame SCHED and has established its NAV properly. Moreover, the station is the Respondent authorized to send traffic related to the data taken only that, hence, reducing delay in the confirmation of reception. Examples of traffic that can benefit from less time on the ACK, are TCP ACKS (confirmation of transmission control Protocol), VoIP (voice over IP), confirmation of blocks, etc.

It is assumed a number of options permits transmission in the opposite direction. For example, the transmitter can put the resolution transmission in the opposite direction to the receiver. According to another example, the transmitter can put the resolution transmission in the opposite direction to the receiver and/or AP (provided that the receiver was STA, other than AP). In accordance with the additional illustration, the transmitter can transmit the transfer resolution in the opposite direction to any STA third party.

Alarm, used to perform a specific RDG with EDCA, can be simplified to facilitate implementation. For example, in the case EDCA, could be used: (i) a single bit can be used to allow the station to the Respondent to know that provided RDG; (ii) three bits can be used to resolve station-the Respondent to learn, the traffic of which class QoS Pets in RDG; and (iii) a single bit can be used to complete answer to the station the Respondent and return TXOP to the initiator. In TXOP not necessary to transmit traffic of a specific class QoS, hence the data associative associated with QoS, may not be used. In addition, you may use the additional information. Moreover, the number of bits for each message type may vary and is dependent on the application.

Frame 716 SCHED determines how STA given the opportunity to access the channel over the coming period of time. Frame 716 SCHED signaled when the STA transmitter should start and/or stop the transfer. Additionally, the frame 716 SCHED indicates when the STA receiver must move to the active state, to start receiving data, and ends when such period as may be adjacent to the period transfer to the STA. STA, whose address does not appear as a transmitter or receiver in the frame 716 SCHED, can go into standby mode to maximize energy savings. The ready to send (CTS) himself 718 can be used to install NAV, associative associated with the frame 716 SCHED. CTS/RTS) 718 can be sent using one of transmission speeds, decoded all the traditional STA, and can be used to improve the protection for the transmission of the data frame. CTS himself 718 may include information about the duration, associative associated with SCHED 716, and/or planned period 720 access.

One of the potential drawbacks of traditional planning mode of operation is the risk of wasting channel if the specified duration of transmission is redundant. Indeed, once sent, the plan is fixed and cannot be modified until, until you send another frame SCHED. Without the use permits transmission in the opposite direction, if the transmitter runs out on traffic to send to a specified receiver within a specified period of time, no other STA cannot use the channel, and resources are being wasted in vain.

Resolution transmission in the opposite direction provide transmitter able to provide the remaining scheduled period of time the receiver. When the transfer resolution in the opposite direction applies to HCCA, the number of surveys sent AP, may decrease by half. For example, instead of planning period of time to STA1 transmitting with STA2 for reception, and one more period of time with STA2 to send and STA1 for reception, the scheduler can group them together. Multiplexing these two threads may provide for simpler and more efficient scheduling algorithms. Should be taken into account that aspects of this disclosure is not limited to these examples.

With reference to Fig-10, illustrated summary of the methods relating to the use permits transmission in the opposite direction, with the planned periods of transmission. For example, the generalized methods can apply to the use of permits transmission in the opposite direction in the environment FDMA (multiple access with frequency division multiplexing), environment OFDMA (multiple access with orthogonal frequency division multiplexing), environment CDMA (multiple access code division multiple access), environment WCDMA (wideband multiple access code division multiple access), environment TDMA (multiple access time division of channels), environment SDMA (multiple access with spatial division multiplexing) or any other suitable wireless environment. Despite the fact that, in order to simplify the explanation, generalized methods are shown and described as a sequence of actions that must be understood and taken into account that the generalized ways not limited procedures, as some might, in accordance with one or more variants of implementation, to take place in different schedule and/or simultaneously with other activities from those illustrated and described in the materials of this application. For example, a generalized manner, alternatively, could be represented as a sequence of related States or events, such as the state diagram. Moreover, not all illustrated steps may be required for the implementation of the generalized method in accordance with one or more variants of implementation.

Fig illustrates a generic way 800 for use permits transmission in the opposite direction within the allocated time period for the implementation of the access channel to promote the reduction of the wasted bandwidth in wireless systems, in accordance with one or more aspects. On 802, the multiple frame survey (for example, frame SCHED), which is used for planning of access channel for some periods of time. For example, multiple frame survey may indicate transmitting station, the receiving station, the initial moment of time and/or duration of access channel for each of the periods of time. In accordance with the example, multiple frame survey can be generated by the access point and transmitted to unequal station; however, aspects of this disclosure are so limited. In addition or in the alternative, the United survey frame SCHED, markers, etc. can be used in connection with the planning of transmission are associated with a certain number of time periods. On 804, data transmission occurs in the first direction for a specific, one of the planned periods of time. The multiple frame survey can be used to identify the transmitter and/or receiver in a specific period of time. Thus, the transmitter can access the channel to transmit data to the receiver (in the first direction) in accordance with multiple frame survey. In 806, resolution transmission in the opposite direction is transferred within a given planned period of time. If the transmitter is completing his transfer before the end of the scheduled period of time, the transfer resolution in the opposite direction can be transmitted to the receiver. 808, data that is transmitted in the second direction (for example, with the station specified as a target frame of multiple polling station specified as transmitter, with the station specified as a target by multiple frame survey on the access point,...), accepted within a specific scheduled time period after the transfer permits transmission in the opposite direction.

Referring to figure 9, illustrated generic way 900 to allow transmission in the opposite direction, with the planned access to the communication channel according to many aspects described in the materials of this application. In 902, the multiple frame survey, which plans to transfer on the channel for a certain number of periods of time. The multiple frame survey can put signs related to what station must maintain contact through the communication channel, and/or when it should be link. Should be taken into account that aspects of this disclosure is not limited to using multiple frame survey. The access point can receive multiple frame survey through the issuance plan, associative associated with a specific scheduled time of access, and the formation of multiple frame survey. In addition, the access point can transmit multiple frame survey on user terminal(s), thereby giving the user terminal(s) the opportunity to receive multiple frame survey. On 904, data is transferred in the first direction within scheduled period of time. The data transfer can occur in accordance with multiple frame survey. On 906, evaluated whether to pass a resolution transmission in the opposite direction. For example, the assessment is made regarding the amount of time remaining in the planned period of time, and/or completed, whether transmitting station, which is specified in the multiple frame survey, your transfer. If it is determined that the transfer resolution in the opposite direction should be provided, 908, resolution transmission in the opposite direction is transferred to the recipient in the first direction within scheduled period of time. On 910, accept data from the receiver permits transmission in the opposite direction, which is passed in the second direction within scheduled period of time. In accordance with the example, the second direction can be the source of the receiver in the original transmitter; however, aspects of this disclosure are so limited.

With reference to figure 10, illustrated generic way of 1000 to apply permissions transmission in the opposite direction, with the planned periods of access to the channel in accordance with various aspects. On 1002, the multiple frame survey, which plans transmission and/or access to the channel for a certain number of periods of time. In 1004, data that is transferred in the first direction is planned transmitter (for example, which is specified by using multiple frame survey), are accepted during the selected time period. On 1006, resolution transmission in the opposite direction is made with the planned transmitter during the selected time period. In 1008, is evaluated to determine whether to use the transfer resolution in the reverse direction during at least part of the remaining period of time. The amount of time remaining within the allocated time period can be taken into account. Additionally or alternatively, the amount of data stored in the buffers associated with the station, which receives the authorization of the transfer in the opposite direction, which should be transmitted, can be considered as part of the assessment. If it is determined that the transfer resolution in the opposite direction should be used in 1010, the data is sent to the station, scheduled to be transmitter, in the second direction during the selected time period. The second direction can be the opposite of the first direction. Additionally or alternatively, a second area can be with the station specified to be the receiver, on the access point. However, aspects of this disclosure is not limited to such illustrations.

According example, one or more of the methods presented above, may include logical conclusions regarding when to pass a resolution transmission in the opposite direction, when to apply permissions transmission in the opposite direction to transfer data, etc.

For example, the transfer resolution in the opposite direction may be taken while time remains in the selected period of time following the data transfer station to the receiving station. To receive the permission of the transfer in the opposite direction on the receiving station can be logical conclusion, would host the station to be able to transfer all or part of their data access channel to the end of the selected period of time. Will be taken into account that the above examples are illustrative in nature and are not intended to limit the number of logical conclusions that can be done, or the way in which such logical conclusions are made, in connection with different variants of implementation and/or in the ways described in the materials of this application.

11 - illustration-user devices 1100, which contributes to the development and/or use permits transmission in the opposite direction, with the planned periods of access to the channel in accordance with one or more aspects contained in the materials of this application. User device contains 1100 receiver 1102, receiving, for example, with the receiving antenna (not shown), and performs the typical steps on it (for example, filters, strengthens, converts with decreasing frequency, and the like) over the received signal and digitizes shown in the right state of alert for obtaining samples. Receiver 1102, for example, can be a receiver with MMSE (minimum mean square error) and may contain demodulator 1104, which can analyze the received symbols and put them in the processor 1106 for the assessment of the channel. Processor 1106 can be processor, a specialized for the analysis of data received by the receiver 1102, and/or generation of data for transmission transmitter 1116, processor, which manages one or more components of a user's device 1100, and/or processor, which analyzes the information, adopted by the receiver 1102 and generate information to send transmitter 1116, and manages one or more components of a user's device 1100.

User device 1100 can optionally contain memory 1108, which expeditiously attached to the processor 1106 and which stores information related to the plans channel access for different periods of time, data that must be transmitted through the transmitter 1116, multiple surveys and any other suitable information to reduce waste communication channel in wireless systems, as described in respect of various figures in the materials of this application. Memory 1108 optionally can store protocols, associative associated with the provision and/or the use of permits transmission in the opposite direction (for example, based on performance-based bandwidth,...), from the condition that the user device 1100 could use stored protocols and/or algorithms that are relevant to the formation and/or use permits transmission in the opposite direction to provide communication capabilities in the second direction within the allotted time period, during which the communication was made to happen in the first direction, as described in the materials of this application.

Will be taken into account that the data warehouse components (such as memory), described in the materials of the present application may be volatile memory, non-volatile memory, or may include both volatile and nonvolatile memory. As an illustration, but not limitation, non-volatile memory can include permanent memory (ROM, ROM), programmable ROM (PROM, PROM), electrically programmable read-only memory (EPROM), electrically erasable PROM (EEPROM EEPROM or flash memory. Volatile memory may include random access memory (RAM), which acts as an external cache memory. As an illustration, but not limitation, RAM suitable in many species, such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), SDRAM with twice the rate of exchange (DDR SDRAM), advanced SDRAM (ESDRAM), synchronous DRAM line (SLDRAM) and RAM bus direct memory access (DRRAM). Memory 1108 presents systems and methods designed to include, without limitation, these and other appropriate types of memory.

Receiver 1102, in addition, operational way connected to the detector 1110 access to the channel that uses the adopted plan (for example, multiple frame survey frame SCHED,...) to determine the period of time in which a user device 1100 should receive and/or transmit data via the standard communication channel. Recognizer 1110 channel access can also use the adopted resolution transmission in the opposite direction in order to give the user device 1100 ability to transmit data through the communication channel. During periods of time when the user device 1100 is not scheduled to receive and/or transmit data, user device 1100 can be in standby mode to reduce power consumption. Recognizer 1110 access to the channel, also can be attached to the driver 1112-resolution transmission in the opposite direction (RDG), which can authorize the transfer in the opposite direction, when a user device 110 completes the transfer within scheduled period of time until the end of the allocated time. The transfer resolution in the opposite direction can be used unequal device for the access to the channel. For example, the transfer resolution in the opposite direction may be used by a station that is receiving the data is passed to the custom device 1100; the receiving station can then use the transfer resolution in the opposite direction for data transmission over the communication channel. User device 1100 also contains modulator 1114 and transmitter 1116, which transmits a signal, for example, in the access point, another custom device etc.

Although portrayed as being separate from the processor 1106, should be taken into account that the Recognizer 1110 channel access, shaper 1112 RDG and/or modulator 1114 can be part of the processor 1106 or a certain number of processors (not shown).

Fig is an illustration of the system 1200, which promotes the planning of channel access and/or use permits transmission in the opposite direction to reduce the waste of bandwidth in wireless systems, in accordance with various aspects. The system contains 1200 point 1202 access with receiver 1210, which receives the signal(s) with one or more custom device 1204 through many receiving antennas 1206, and transmitter 1224, which makes a transfer to one or more user devices 1204 through transmitting antennas 1208. Receiver 1210 can receive information from receiving antennas 1206 and expeditious manner demodulator 1212 that demodulates the newly received information. Demodulated characters are analyzed processor 1214, which can be similar to the processor, as described above on Fig. 11, and attached to the memory 1216 that stores related information with the planning data, data that must be passed to user device(a) 1204, and/or any other pertinent information relevant to the implementation of various actions and functions contained in the materials of this application. Processor 1214, in addition, attached to the scheduler 1218, which is developing a plan for channel access. For example, the scheduler 1218 can generate multiple survey, which includes a number of surveys, and each of the surveys can specify the starting time for a particular show duration for transmission, the particular station that transmits data, and/or the particular station that receives the data. The scheduler 1218 can apply the information relevant to the plan (for example, multiple polling) to the signal generated by the processor 1214, for transmission to user device(a) 1204. Modulator 1224 can multiplex signal for transmission by a transmitter 1226 through transmitting antenna 1208 on the user device(a) 1204.

Fig shows a sample system 1300 wireless. The system 1300 wireless, for the sake of brevity, depicts one access point and one terminal. However, it should be taken into account that the system can include more than one access point and/or more than one terminal, with additional access points and/or terminals, in essence, may be similar or different relative approximate access point and terminal, described below. In addition, should be taken into account that the access point and/or terminal, you can use system (Fig.1-2 and 11-12) and/or processes (Fig-10), described in the materials of this application, to facilitate wireless communication between them.

Further, with reference to Fig, in the descending line, at the point 1305 access, the processor 1310 data transmission (TX) adopt, formats, codes, punctuates and modulates (or displays in characters) traffic data and issues modulated characters (character data). Modulator 1315 characters receives and processes data characters and symbols, pilot signal and generates a stream of characters. Modulator 1315 characters multiplexes data characters and symbols, pilot signal and displays them in a knot 1320 transmitter (TMTR). Each character transfer can be character data, the symbol of the pilot signal or a value of zero signal. Characters, pilot signal can always go in each period character. Characters, pilot signal can be multiplexed with frequency separation (FDM), multiplexed with orthogonal frequency division (OFDM), multiplex time division (TDM), multiplexing frequency division (FDM), or multiplexed code division (CDM).

TMTR 1320 receives and converts the stream of characters in one or more analog signals, and additionally leads to the desired state (for example, increases, filters and transforms with increasing frequency analog signals to signal downlink suitable for transmission over the wireless link. Signal downlink is then passed through the antenna 1325 on terminals. In the terminal 1330, antenna 1335 receives the signal downlink and gives a signal to the host 1340 receiver (RCVR). Site 1340 receiver leads to the desired state (for example, filters, strengthens, converts with decreasing frequency) signal and digitizes shown in the right state of alert for obtaining samples. Demodulator 1345 characters demodulates and displays the received symbols pilot signal processor 1350 for the assessment of the channel. Demodulator 1345 characters, in addition, takes assessment of frequency response for the downlink of the processor 1350, performs demodulation data on the accepted character data to obtain estimates of data characters (which are the estimates of characters transferred data), and give an estimate of the character data in the processor 1355 data RX that demodulates (that is, displays of characters), addresses the alternation and decodes assessment characters recovery of data transmitted traffic. Treatment demodulator 1345 characters and processor 1355 data RX is a complementary treatment modulator 1315 characters and processor 1310 data TX, respectively, at the point 1305 access.

In the ascending line, processor 1360 TX data processing data traffic and generates data characters. Modulator 1365 characters accepts and multiplexes data characters with character, pilot signal, performs modulation and produces a stream of characters. Site 1370 transmitter then receives and processes the stream of characters to signal ascending line of communication that is transmitted by the antenna in 1335 point 1305 access.

At the point 1305 access, signal uplink connection from terminal 1330 accepted antenna 1325 and processed by the node 1375 receiver to receive samples. Demodulator 1380 character, then processes the sample and give an estimate of accepted characters, pilot signal and data characters for uplink connection. Processor 1385 data RX processes assessment of characters of data to recover the data traffic sent by the terminal 1330. Processor 1390 evaluates channel for each active terminal, carrying out the transmission in the ascending line of communication. Many terminals can transmit the pilot signal simultaneously in the ascending line of communication in their respective assigned set of subranges pilot signals, and sets of subranges pilot signals can be interspersed.

Processors 1390 and 1350 control (for example, control, coordinate, dispatch and so on) work at the point 1305 access and terminal 1330, respectively. The respective processors 1390 and 1350 can be associatively related memory nodes (not shown)that store management software and data. Processors 1390 and 1350 can also perform calculations to derive estimates of the frequency and pulse characteristics for upward communication and downlink, respectively.

For systems multiple access (e.g., FDMA, OFDMA, CDMA, TDMA, and so on), many terminals can transmit simultaneously in the ascending line of communication. For such a system, sub-bands pilot signals can be shared between different terminals. Technology assessment channel can be used in cases where the sub-bands pilot signals for each terminal block full frequency range (with the possible exception of range boundaries). This structure of subranges pilot signals would be desirable to receive frequency diversity for each terminal. The techniques described in the materials of this application, can be implemented by different means. For example, these technologies can be implemented in hardware, software, or both. For hardware implementation, the processing units are used for the assessment of the channel, can be implemented within one or more specific integrated circuits (ASIC), digital signal processors (DSPS DSP), device, digital signal processing (DSPD), programmable logic devices (PLD), user-programmable gate arrays (FPGA), processors, controllers, microcontrollers, microprocessors and other electronic components intended to perform the functions contained in the materials of this application, or both. Software implementation can take place through modules (such as procedures, functions, and so on)that perform the functions described in the materials of this application. Engine programs can be stored in the memory nodes and to run processors 1390 and 1350.

For the software implementation, technology, described in the materials of this application can be implemented using modules (such as procedures, functions, and so on)that perform the functions described in the materials of this application. Engine programs can be stored in nodes memory and executed by the processors. The node memory can be implemented within the processor or it can be external to the processor, in this case it can be attached to the processor through a variety of tools with the ability to communicate, as it is known in the art.

What has been described above, includes examples of one or more options for implementation. Of course, it is impossible to describe every conceivable combination of components or methodologies to describe the above-mentioned options for implementation, and many more possible combinations and modified forms of different variants of implementation. Accordingly, describes the different ways of implementation are designed to cover all such changes, modifications and variants, which fall under the nature and scope included the claims. Moreover, to the extent that the term includes" is used in a detailed description or the claims, the term assumes including, to some extent, just as the term "contains" is interpreted as "containing", when used as a transitional words in the claims.

1. Way of planning with a resolution of transmission in the opposite direction in wireless systems containing stages, which take the receiver multiple frame survey from the transmitter, which plans transmission for short periods of time, related to transfer opportunities; transmit data in the first direction from the receiver to the transmitter, which plans to transfer, during a specific period of the planned periods of time, associated with a particular transmission, according to multiple frame survey, and the data transfer is complete before the end of a specific period of the planned periods of time; they transfer the transfer resolution in backward direction from the receiver to the transmitter, which plans to transfer, during a specific period of the planned time periods connected with a concrete opportunity to transfer, the transfer resolution in the opposite direction allows the transmitter, which plans to transfer, transfer the data in the second direction to the receiver using a specific period of the planned periods of time, associated with a particular transmission; and take in the receiver data in the second direction from the transmitter, which plans to transfer, during a specific period of planned time periods related to a specific transmission.

2. The method according to claim 1, additionally contains a stage at which passed three bits of data from the transmitter to the receiver to specify the class quality of service (QoS) permits transmission in the opposite direction.

3. The method according to claim 1, and a wireless communications system uses multiplexing orthogonal frequency division multiplexing (OFDM).

4. The method according to claim 1, with permission of transmission in the opposite direction indicate one bit.

5. The method according to claim 1, and the transmitter, which plans transmission, includes the access point.

6. The method according to claim 1, additionally contains a stage where assess whether to pass a resolution transmission in the opposite direction.

9. The method of claim 8, and an assessment of whether to use the adopted resolution transmission in the opposite direction, contains the stage at which: evaluate at least one of the amount of time remaining in a particular period of the planned time periods and the amount of data that must be passed in the second direction for access to the channel.

10. The method according to claim 1 in which the plan of multiple frame survey includes, for each of the several periods of time, the information associated with the appropriate transmission, and includes at least one of the relevant identity station transmitter, the corresponding identity station receiver corresponding to the initial moment of time and the duration.

11. The device for wireless communication that contains a tool for admission to the receiver multiple frame survey from the transmitter, which plans transmission for multiple periods time-related transfer opportunities; the means for data transmission in the first direction from the receiver to the transmitter, which plans to transfer, during a specific period of the planned periods of time, associated with a particular transmission, according to multiple frame survey, and the data transfer is completed before the end of a specific period of the planned periods of time; the tool to transfer permits transmission in the opposite direction from the receiver to the transmitter, which plans to transfer, during a specific period of the planned periods of time, specific to the possibility of transmission, and the transfer resolution in the opposite direction allows the transmitter, which plans to transfer, transfer the data in the second direction to the receiver using a specific period of the planned periods of time, associated with a particular transmission; and means for receiving the data sink in the second direction from the transmitter, which plans to transfer, during a specific period of the planned periods of time, associated with a particular transmission.

12. The device according to claim 11, additionally contains a tool for the transmission of three bits of data from the receiver to the transmitter to specify the class quality of service (QoS) permits transmission in the opposite direction.

13. The device according to claim 11, and a wireless communications system uses multiplexing orthogonal frequency division multiplexing (OFDM).

14. The device according to claim 11, and the transfer resolution in the opposite direction indicated one bit.

15. Machine-readable storage medium containing the stored commands for wireless communication, and the commands at execution instruct the processor to execute a method that contains the stages, which take the receiver multiple frame survey from the transmitter, which plans transmission for short periods of time, related to transfer opportunities; transmit data in the first direction from the receiver to the transmitter, which plans to transfer, during a specific period of the planned periods of time, associated with a particular transmission, according to multiple frame survey, and the data transfer is complete before the end of a specific period of the planned periods of time; passed a resolution transmission in reverse direction from the receiver to the transmitter, which plans to transfer, during a specific period of the planned time periods connected with a concrete opportunity to transfer, the transfer resolution in the opposite direction allows the transmitter, which plans to transfer, transfer the data in the second direction to the receiver using a specific period of the planned periods of time, associated with a particular transmission; and take in the receiver data in the second direction from the transmitter, which plans to transfer, during a specific period of the planned periods time related to a specific transmission.

16. Machine-readable medium of information indicated in paragraph 15, and the transfer resolution in the opposite direction indicated one bit.

19. The device for wireless communication containing a transmitter for transmitting multiple frame survey, at least in the same station, and multiple frame survey plans transmission for short periods of time, related to transfer opportunities; and receiver to receive data in the first direction from the station during a specific period of the planned periods of time, associated with a particular transmission according to multiple frame survey, and the data reception is cancelled before the end of a particular period of the planned periods of time; moreover, the receiver receives the transfer resolution in the opposite direction from station within a specific scheduled time period associated with the particular transmission, and the transfer resolution in the opposite direction enables the device to send data in the second direction in the station, using a specific period of the planned periods of time, associated with a particular transmission; and the transmitter transmits the data in the second direction in the station during a specific period of the planned periods of time, associated with a particular transmission.

20. The device according to claim 19, and the transfer resolution in the opposite direction indicated one bit.