CN101953221B - A method and device for determining a data transmission characteristic - Google Patents
A method and device for determining a data transmission characteristic Download PDFInfo
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- CN101953221B CN101953221B CN200880126954.XA CN200880126954A CN101953221B CN 101953221 B CN101953221 B CN 101953221B CN 200880126954 A CN200880126954 A CN 200880126954A CN 101953221 B CN101953221 B CN 101953221B
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Abstract
A method for determining a data transmission characteristic, wherein data are transmitted in at least one superframe, wherein each superframe is configured to transmit a plurality of frames, is provided, the method comprising: sending, in the superframe, a plurality of data transmission characteristic request messages to a receiver for requesting data transmission characteristic information from the receiver, wherein the data transmission characteristic request messages are command/control messages; receiving, in the superframe, a plurality of data transmission characteristic response messages including data transmission characteristic information from the receiver in response to the data transmission characteristic request messages wherein the data transmission characteristic response messages are command/control messages; determining, from the data transmission characteristic information, at least one data tran0smission characteristic.
Description
The cross reference of associated documents
The application requires the priority of No. 61/019,681, the U.S. Provisional Application of submitting on January 8th, 2008, for all objects are incorporated to its full content herein by reference.
Technical field
Each embodiment relates to field of wireless communications, for example, relate to wireless communication system.For example, each embodiment relates to a kind of method for specified data transmission characteristic.Particularly, the present invention relates to WiMedia distributed MAC protocol, and the future version of IEEE 802.11MAC, IEEE 802.15.3MAC, IEEE 802.15.4MAC and any other relevant MAC agreement.
Background technology
In the current version of WiMedia standard, existing link feedback mechanism only allows each superframe (superframe) (65ms) to feed back from receiver to transmitter.Particularly, current feedback mechanism allows receiver increase or reduce to advise the differential of transmission rate and transmitted power.But, it should be noted that the coherence time of channel can be much smaller than 65ms.
Therefore, need a kind of feedback strategy of link feedback more frequently that allows to exist between transmitter and receiver.In addition, conventionally preferably implement power control and rate control algorithm in sender side.Receiver is not known transmitted power conventionally.Therefore, preferably implement power control algorithm at transmitter place.Several speed and the power control algorithms that can implement in sender side have been proposed in document (referring to [5]-[8]).
Particularly, under mobile environment, may reduce (< < 65ms) coherence time of UWB channel.The link feedback mechanism that current WiMedia MAC allows each superframe (～65ms) to carry out.Current feedback mechanism allows receiver increase or reduce to advise the differential of transmission rate and transmitted power.
But, need one to meet to have the link feedback mechanism of the demand of the channel of low coherence time (< < 65ms).
Also need a kind of method that flexibility speed and power control being combined in sender side can be provided to implementer.
In [3], the method for a kind of use based on confirm the reserved place in (B-ACK, Block Acknowledgement) frame [2] at block proposed.B-ACK frame is recognized the correct or incorrect reception of a upper frame sequence, and is provided for the information of the transmission of next frame sequence.But, it should be noted that transmitter can use the transmission frame without confirming (No ACK, No-Acknowledgement) strategy.Even if sent acknowledgement frame, sending acknowledgement frame to the frequency of transmitter can different (irrelevant with the coherence time of channel).In addition, need to carry out at transmitter place speed and power control (only knows transmitted power at transmitter place, and has proposed in the literature multiple speed and the power control algorithm that can implement at transmitter place; Referring to [5]-[8]).
In an embodiment of the present invention, by the solution that uses two to be provided link feedback by the order/control frame between the device of WiMedia (ECMA specification [1] is based on WiMedia standard [2]) specification.Described solution meets the demand of low channel coherence time (its can much smaller than 65ms), and some of them method allows power control and speed control to be incorporated in transmitter node place.
Summary of the invention
The invention provides a kind of method for specified data transmission characteristic, wherein, data are transmitted at least one superframe, wherein each superframe is configured to transmit multiple frames, the method comprises: in this superframe, multiple Data Transmission Feature request messages are sent to receiver, Data Transmission Feature information with request from receiver, wherein said Data Transmission Feature request message is order/control message; In this superframe, receive the multiple Data Transmission Feature response messages in response to Data Transmission Feature request message from receiver, described Data Transmission Feature response message comprises Data Transmission Feature information, and wherein said Data Transmission Feature response message is order/control message; From this Data Transmission Feature information, determine at least one Data Transmission Feature.
Brief description of the drawings
Need not draw to scale accompanying drawing, but focus in the explanation of the principle to various embodiment.In the following description, with reference to following accompanying drawing, various embodiment are described, in the accompanying drawings:
Fig. 1 represents the structure of superframe;
Fig. 2 is the figure that represents communication system;
Fig. 3 represents the order/control frame payload (payload) according to an embodiment;
Fig. 4 represents the order/control frame payload according to an embodiment;
Fig. 5 represents the order/control frame payload according to an embodiment;
Fig. 6 represents the order/control frame payload according to an embodiment;
Fig. 7 represents the order/control frame payload according to an embodiment;
Fig. 8 represents the order/control frame payload format according to an embodiment; And
Fig. 9 represents according to the communicator of an embodiment.
Embodiment
Information as a setting, according to ECMA standard, the serve as reasons unit of the data that device transmits of frame definition, and superframe is defined as the periodicity time interval for frame transmission between conditioning unit in ECMA standard, and be the basic sequential organization for frame transmission.Superframe is made up of 256 media interviews time slots (MAS, Medium Access Slot), and superframe comprises the beacon period (BP, Beacon Period), and the beacon period is data period subsequently.BP comprises multiple beacon slots, and beacon can transmit in beacon slot.MAS duration be 256 microseconds (μ s) and superframe duration be about 65ms.The beacon period (BP) may be defined as the period of being declared by device, and during this period, described device sends or monitors according to the beacon of ECMA standard, and term " beacon " can refer to about the reserved information such as time slot in another data period.Each superframe starts with BP, and extends in a media interviews time slot (MAS) being connected above.
Fig. 1 represents according to the basic structure of the superframe 110 of ECMA standard.Superframe 110 comprises the beacon period 101, and is data period 102 subsequently, wherein the frame definition unit of the data that device transmits that serves as reasons.Superframe is made up of 256 MAS 103.
Fig. 2 represents the diagram of the communication system 200 that comprises communicator A to H (211～218).In one embodiment, this communication system can be point-to-point (ad-hoc) communication group (beacon group) 200 that comprises point-to-point communication device A to H (211～218), and wherein all device A to H (211～218) run on specific channel.Point-to-point radio communication group is made up of multiple point-to-point radio communication devices conventionally, and wherein the communication between these devices is self-organizing.The plurality of device can find within the specific limits each other and form communication group, and in this communication group, and described device can communicate with one another and without center-control.Term " channel " can refer to the combination of more than one frequency band that can be used for signal transmission.Term " frequency band " can refer to the predetermined cline frequency scope for signal transmission.For example, circle 201 represents the transmission range of device B 212, means that device B can send data to other communicators that are positioned within circle 201.In this diagram, device B 212 can send data to device A 211, C 213, D 214, E 215 and H 218.In like manner, circle 202 represents the transmission range of device C 213, mean that device C can send data to other communicators that are positioned within circle 202, and circle 203 represents the transmission range of device D 214, mean that device D can send data to other communicators that are positioned within circle 203.In point-to-point (ad hoc) communication group, any two communicators just can communicate with one another without center-control, and exchange message or data each other.
In another scheme, communication system 200 can have center-control, for example, as the Node B 212 of piconet coordinator (PNC, Pico Net Coordinator) (referring to [4]).In this scheme, the any device (such as device A 211, C 213, D 214, E 215 and H 218) that enters the transmission range of PNC B 212 may need to communicate with PNC B 212, to ask to set up about the information of channel or within the transmission range 201 of PNC B 212 and the communicating by letter of another communicator.PNC B 212 can will be sent to each device of the transmission range that enters PNC B 212 about the information of other communicators.In other words, in this embodiment, want any two devices that communicate with one another first to communicate by letter with the central controller such as PNC, and this central controller can help these two devices to set up communication at transmission and receipt message between these two devices and between these two devices.
In one embodiment, each device of communication system 200 can be equipped with transmitter and receiver.In one embodiment, the communicator shown in Fig. 2 can be sent to another device or PNC by information or data or message by transmitter.In one embodiment, the communicator shown in Fig. 2 can receive information or data or the message from another device or PNC by receiver.
The agreement of WiMedia standard and facility are supported by the information exchange between installing.For every category information, definition has information element (IE, Information Element).IE can be included in its beacon by device at any time, and utility command frame is asked or provided alternatively.IE is included in beacon and command frame, and it is passing on some controls and management information.
According to current WiMedia standard, link feedback IE comprises the information of the variation of the recommendation to data rate and transmit power levels of being recommended for more than one source apparatus by receiving system.Device can feed back link IE and be included in its beacon, with to providing feedback with the link of special neighbourhood device.
Receiving system can feed back IE with link and carry out the best data rate that suggestion is used by source apparatus, for example to improve throughput and/or to reduce frame error rate.For acceptable frame error rate, the data rate in link feedback IE should be interpreted as the maximum data rate that this source apparatus should be used for this concrete link.Source apparatus need not be followed this suggestion.
Receiver can be by comprising that at its beacon link feedback IE recommends the transmit power levels being used by source apparatus to change.And do not require that the device that receives link feedback IE changes its transmit power levels.Receiver can use signal to noise ratio, the signal strength signal intensity, frame error rate or other parameters that receive and determine transmit power levels, to recommend source apparatus.
According to current WiMedia standard, the each superframe of link feedback IE sends once.But the coherence time of channel can be much smaller than the duration of superframe, described superframe duration is 65.536ms.Therefore, need a kind of new link feedback strategy, it can meet the demand of lower coherence time.
A kind of new link feedback strategy of order/control frame of operative installations has been proposed in one embodiment.The strategy proposing meets the demand of lower channel coherence time (being less than superframe duration, i.e. a 65.536ms), and some of them strategy also allows to carry out power and speed control in sender side.
In one embodiment, a kind of method for specified data transmission characteristic is provided, wherein data are transmitted at least one superframe, each superframe is configured to transmit multiple frames, the method comprises: in this superframe, multiple Data Transmission Feature request messages are sent to receiver, Data Transmission Feature information with request from receiver, wherein said Data Transmission Feature request message is order/control message; In this superframe, receive the multiple Data Transmission Feature response messages in response to Data Transmission Feature request message from receiver, described Data Transmission Feature response message comprises Data Transmission Feature information, and wherein said Data Transmission Feature response message is order/control message; From this Data Transmission Feature information, determine at least one Data Transmission Feature.
In other words, in one embodiment, in order to determine at least one Data Transmission Feature, device A can be in superframe every mistake ' x ' μ s or every ' x ' μ s send at least one times Data Transmission Feature request message and install B to another.Because the duration of superframe is about 65ms, therefore the transmitter of device A can send multiple Data Transmission Feature request messages to the receiver that installs B in this superframe.In one embodiment, the receiver of device B can be by being sent to device A by Data Transmission Feature response message and each Data Transmission Feature request message being responded, and wherein this Data Transmission Feature response message comprises at least one Data Transmission Feature.In one embodiment, device A determines at least one Data Transmission Feature based on Data Transmission Feature response message.In one embodiment, Data Transmission Feature request message and Data Transmission Feature response message are order/control frame.
In one embodiment, the Data Transmission Feature request message being sent by device A also can comprise Data Transmission Feature information or at least one Data Transmission Feature.In one embodiment, based at least one Data Transmission Feature request message and/or at least one Data Transmission Feature response message, device A and device B can determine at least one Data Transmission Feature.In one embodiment, Data Transmission Feature can refer to about the transmission rate of transfer of data or the information of transmitted power, but be not limited to this.In one embodiment, Data Transmission Feature can refer to link-quality instruction (LQI, Link Quality Indicator) or signal to noise ratio (SNR, Signal to Noise Ratio).In one embodiment, the Data Transmission Feature grouping number really receiving of can making a comment or criticism.In one embodiment, Data Transmission Feature can refer to the grouping number of losing.In one embodiment, Data Transmission Feature can refer to the received grouping number with Frame Check Sequence (FCS, Frame Check Sequence) error (and not having a verification sequence (Header Check Sequence) error or HCS error).In one embodiment, Data Transmission Feature can refer to the expectation recipient's who is sent to this command frame grouping number.In one embodiment, Data Transmission Feature can refer to the size with the measurement window of microsecond or milli seconds counter.
In one embodiment, order/control message is order/control frame.According to WiMedia standard, order/control frame sends order/control information between the communicator in communicator group.
In one embodiment, device transmits two or more frames (or set of two or more frames) in superframe, and (for example, in the time starting), sends at least one Data Transmission Feature request message by this device before each set of being transmitted two or more frames by this device.
In other words, in one embodiment, each set of the frame transmitting in superframe for device, send transmission characteristic request message by this device, thereby this device carry out to the transmission heel of characteristic request message along with the reception to characteristic response message of being undertaken by this device, and the transmission of each set to frame that this device of serving as reasons subsequently carries out (, this device does not transmit other frames between each set of characteristic request message and frame).
In one embodiment, periodically send Data Transmission Feature request message.In one embodiment, during each predetermined periodicity time interval, send Data Transmission Feature request message at least one times.
In one embodiment, transmitter and receiver are according to the communicator of WiMedia specification.
In one embodiment, transmitter and receiver are according to the communicator of IEEE 802.15.3b specification.
In one embodiment, Data Transmission Feature request message is MAC layer message.In one embodiment, Data Transmission Feature response message is MAC layer message.
In one embodiment, transfer of data comprises the transmission of multiple packets, and Data Transmission Feature information comprises the number of data packets correctly being received by receiver or number of data packets or the number of data packets with FCS error (and not having HCS error) receiving or the number of data packets being sent in the measurement window period by receiver of loss.In one embodiment, Data Transmission Feature information also comprises the information about the measurement window period.
In one embodiment, transfer of data is carried out via the communication link between transmitter and receiver, and Data Transmission Feature information is communication link feedback information or link quality information.
In one embodiment, Data Transmission Feature information comprises the information about the signal to noise ratio at receiver place relevant with transfer of data.
In one embodiment, Data Transmission Feature response message comprises the information for the transmit power levels of setting data transmission.
In one embodiment, Data Transmission Feature response message comprises the information for the transmission data rate of setting data transmission.
In one embodiment, aperiodicity ground sends Data Transmission Feature request message.
In one embodiment, Data Transmission Feature response message comprises the information for the data rate of setting data transmission.
In one embodiment, Data Transmission Feature information comprise the information that changes about the information of advised data rate, about suggestion transmit power levels, about the information of the received grouping number with error, about the information of the grouping number of losing, about transfer to command frame recipient grouping number information, about the information of measurement window, about the information of the grouping number of correct reception and about the information of the SNR/LQI of communication link.
In one embodiment, the every mistake of transmitter ' x ' μ s or every ' x ' μ s are at least one times or aperiodicity ground or at beginning transmission command/control frame or the Data Transmission Feature request message of frame exchange, once and receive orders/control frame or request message, for example can be short interframe space (SIFS, Short Interframe Spacing) the fixing period after, receiver is made answer with order/control frame or Data Transmission Feature response message.
In one embodiment, after receiving Data Transmission Feature request message, device sends Data Transmission Feature response message time in response to this Data Transmission Feature request message is given as:
PSIFS+pSlotTime+ (positional value in device list) × (the command frame duration+pSIFS of Data Transmission Feature response message)
Wherein, pSIFS and pSlotTime can have value as defined in ECMA standard.
In one embodiment, the Data Transmission Feature response message transmitting in response to Data Transmission Feature request message comprises the duration field with the duration value given by following formula:
The command frame body transmission time of command frame transmission time+Data Transmission Feature response message of duration value-(the command frame body transmission time+pSIFS of Data Transmission Feature request message)-Data Transmission Feature response message that Data Transmission Feature request message comprises
Wherein, pSIFS can have value as defined in ECMA standard.
In one embodiment, the Data Transmission Feature response message transmitting in response to Data Transmission Feature request message comprises the duration field with the duration value given by following formula:
The command frame body transmission time of command frame transmission time+Data Transmission Feature response message of duration value-(command frame body transmission time+pSIFS+pSlotTime+ (positional value in the list of Data Transmission Feature request message) × (the command frame transmission time+pSIFS of Data Transmission Feature response message) of Data Transmission Feature request message)-Data Transmission Feature response message that Data Transmission Feature request message comprises
Wherein, pSIFS and pSlotTime can have value as defined in ECMA standard.
Hereinafter, five different embodiment (for five kinds of order/control frame possible frame payload formats) have been shown.In one embodiment, transmitter can every mistake ' x ' μ s (or every ' x ' μ s at least one times) and/or in the beginning of frame exchange or aperiodicity comprise order/control frame (payload as shown in variety of option; Consult Fig. 2～Fig. 6), once and receive orders/control frame, after being for example the fixing period of short interframe space (SIFS) [2], receiver is made answer with order/control frame.
In one embodiment, the order/control frame being sent by the transmitter of request msg transmission characteristic is called " link feedback request frame ".In one embodiment, the order/control frame being sent in response to link feedback request frame by receiver is called " link feedback is answered frame ".
Fig. 3 represents the order/control frame payload format 300 according to an embodiment.
Frame 310 represents the payload of the order/control frame being sent by transmitter (Data Transmission Feature request message) in one embodiment.The payload of the order/control frame 310 being sent by transmitter in one embodiment, comprises an eight bit byte 301.In one embodiment, the bit format of eight bit byte 301 is as shown in 330: the position 1～position 7 305 of eight bit byte 301 can be reserved, and in the time that this frame is link feedback request frame (Data Transmission Feature request message), position 0 306 can be made as 0.
In one embodiment, transmitter can every mistake ' x ' μ s (or every ' x ' μ s at least one times or aperiodicity ground) and/or send order/control frame 310 at the section start of frame exchange, once and receive the order/control frame from this transmitter, after being for example the fixing period of SIFS, receiver can be made answer with order/control frame.
Frame 320 represents the payload of the order/control frame from receiver in response to link feedback request frame (Data Transmission Feature request message) (Data Transmission Feature response message) according to an embodiment.
In one embodiment, Data Transmission Feature response message 320 can comprise that link FEEDBACK CONTROL eight bit byte 302,302 represents that this message response sends in link feedback request frame 310.In one embodiment, Data Transmission Feature response message 320 can comprise the grouping number that one or two eight bit byte 303,303 instructions correctly receive from the exchange of a upper link feedback command/control frame.In one embodiment, Data Transmission Feature response message 320 can comprise an eight bit byte 304,304 instruction LQI or signal to noise ratios (SNR).In one embodiment, the position 1～position of link FEEDBACK CONTROL eight bit byte 302 7 305 is reserved, and position 0 306 is set as 1, to indicate this message 320 for link feedback answer frame (Data Transmission Feature response message).
Embodiment as shown in Figure 3 allows to carry out at transmitter place power and speed control.Feedback information comprises SNR or LQI and the grouping number correctly receiving.
Fig. 4 represents the order/control frame payload format 400 according to an embodiment.
Frame 410 represents the payload of the order/control frame from transmitter (Data Transmission Feature request message) in an embodiment.In one embodiment, can comprise an eight bit byte 401 from the payload of the order/control frame 410 of transmitter.In one embodiment, eight bit byte 401 can have the bit format as shown in format 4 30: the position 1～position 7 406 of eight bit byte 401 can be reserved, and in the time that this frame is the link feedback request frame (Data Transmission Feature request message) from this transmitter, position 0 407 can be made as 0.
Frame 420 represents the payload of the order/control frame from receiver in response to Data Transmission Feature request message 410 (Data Transmission Feature response message) according to an embodiment.
In one embodiment, order/control frame 420 comprises that link FEEDBACK CONTROL eight bit byte 402,402 represents that these message are in response to link feedback request frame 410 and sends.In one embodiment, order/control frame 420 can comprise that an eight bit byte 403,403 designation data speed and transmit power levels change.In one embodiment, 3/ the 4～position 7 404, position of eight bit byte 403 can be used for designation data speed.In one embodiment, 2/ 3 405 of the position 0～position of eight bit byte 403 can be used for indicating transmit power levels to change.
In one embodiment, eight bit byte 402 can have the bit format as shown in format 4 30: the position 1～position 7406 of eight bit byte 402 can be reserved, and when this frame is that while answering frame (Data Transmission Feature response message) from the link feedback of receiver, position 0 407 can be made as 1.
In one embodiment, the every mistake of transmitter ' x ' μ s (or every ' x ' μ s at least one times or aperiodicity ground) and/or comprise order/control frame (payloads as shown in 410) at the section start of frame exchange, once and receive orders/control frame, after being for example the fixing period of SIFS, receiver can be made answer with order/control frame.
Embodiment as shown in Figure 4 allows to carry out speed control at receiver place, and allows the information that the incremented/decremented about power is changed to feed back to transmitter.Feedback information from receiver to transmitter comprises the increase of output power of data rate and incremented/decremented/reduce.
Fig. 5 represents the order/control frame payload format 500 according to an embodiment.
In one embodiment, order/control frame (the link feedback request frame being sent by transmitter, be Data Transmission Feature request message) and order/control frame of being sent in response to link feedback request frame by receiver (link feedback is answered frame, i.e. Data Transmission Feature response message) can have and form identical shown in frame 510.
In one embodiment, order/control frame 510 can comprise link FEEDBACK CONTROL eight bit byte 501.In one embodiment, order/control frame 510 can comprise the grouping number (, since a upper link feedback command/control frame exchanges) that one or two eight bit byte 502 correctly receives with instruction.In one embodiment, order/control frame 510 can comprise that an eight bit byte 503 is with instruction LQI or SNR.
In one embodiment, the bit format of link FEEDBACK CONTROL eight bit byte 501 is as shown in frame 520.Position 2～the position 7 504 of link FEEDBACK CONTROL eight bit byte 501 can be reserved.In one embodiment, whether the position 1 505 of link FEEDBACK CONTROL eight bit byte 501 there are two or three other eight bit bytes (502 and/or 503) after can be used for indicating the link FEEDBACK CONTROL eight bit byte 501 comprising at order/control frame 510.In one embodiment, position 1 505 can be made as 0, after indicating the link FEEDBACK CONTROL eight bit byte 501 comprising at order/control frame 510, does not have two or three other eight bit bytes (502 and/or 503).In one embodiment, position 1 505 can be made as 1, after indicating the link FEEDBACK CONTROL eight bit byte 501 comprising at order/control frame 510, has two or three other eight bit bytes (502 and/or 503).In one embodiment, to can be used for indicating this order/control frame be link feedback request frame, i.e. Data Transmission Feature request message in the position 0 506 of link FEEDBACK CONTROL eight bit byte 501.In one embodiment, position 0 506 is made as 0, to indicate this order/control frame as link feedback request frame, i.e. Data Transmission Feature request message.In one embodiment, to can be used for indicating this order/control frame be that link feedback is answered frame, i.e. Data Transmission Feature response message in the position 0 506 of link FEEDBACK CONTROL eight bit byte.In one embodiment, position 0 506 is made as 1, to indicate this order/control frame to answer frame, i.e. Data Transmission Feature response message as link feedback.
In one embodiment, the every mistake of transmitter ' x ' μ s (or every ' x ' μ s at least one times or aperiodicity ground) and/or comprise order/control frame (payload as shown in form 510) at the section start of frame exchange, once and receive orders/control frame, after being for example the fixing period of SIFS, receiver can be made answer (transmitter also can provide feedback to receiver) with order/control frame.
Embodiment as shown in Figure 5 allows to carry out the exchange of link feedback information between transmitter and receiver.Feedback information comprises SNR/LQI and the grouping number correctly receiving.In this embodiment, between frame commutation period, can side by side carry out speed and power control at transmitter and receiver node place.
Fig. 6 represents the order/control frame payload format 600 according to an embodiment.
In one embodiment, order/control frame of being sent by transmitter (link feedback request frame, i.e. Data Transmission Feature request message) and order/control frame of being sent in response to link feedback request frame by receiver (link feedback is answered frame, i.e. Data Transmission Feature response message) can have and form identical shown in frame 610.
In one embodiment, order/control frame 610 can comprise link FEEDBACK CONTROL eight bit byte 601 and link feedback eight bit byte 602.
In one embodiment, the bit format of link feedback eight bit byte 602 is as shown in 620.In one embodiment, 3/ the 4～position 7 603, position of link feedback eight bit byte 602 can be used for designation data speed.In one embodiment, 2/ 3 604 of position 0～position can be used for indicating transmit power levels to change.
In one embodiment, the bit format of link FEEDBACK CONTROL eight bit byte 601 is as shown in 630.In one embodiment, the position 2～position 7 605 of link FEEDBACK CONTROL eight bit byte 601 can be reserved.In one embodiment, the position 1 606 of link FEEDBACK CONTROL eight bit byte 601 can be used for instruction and after order/control frame 610 link FEEDBACK CONTROL eight bit bytes 601, whether comprises link feedback eight bit byte 602.In one embodiment, to can be used for indicating this order/control frame 610 are link feedback request message (Data Transmission Feature request message) or link feedback answer message (Data Transmission Feature response message) in the position 0 607 of link FEEDBACK CONTROL eight bit byte 601.In one embodiment, position 0 607 is made as 0, to indicate this order/control frame as link feedback request message.In one embodiment, position 0607 is made as 1, to indicate this order/control frame as link feedback response message.
In one embodiment, the every mistake of transmitter ' x ' μ s (or every ' x ' μ s at least one times or aperiodicity ground) and/or comprise order/control frame (payloads as shown in 610) at the section start of frame exchange, once and receive orders/control frame, after being for example the fixing period of SIFS, receiver can be made answer (transmitter node also can provide feedback to receiver node) with order/control frame.
The link feedback information of the WiMedia standard of embodiment as shown in Figure 6 based on as the current the increase of output power of data rate and the incremented/decremented (/ reduce).In this embodiment, between frame commutation period, can side by side carry out speed control at transmitter and receiver place.
Fig. 7 represents the order/control frame payload format 700 according to an embodiment.
In one embodiment, order/control frame of being sent by transmitter (link feedback request frame, i.e. Data Transmission Feature request message) and order/control frame of being sent in response to link feedback request frame by receiver (link feedback is answered frame, i.e. Data Transmission Feature response message) can have and form identical shown in frame 710.
In one embodiment, order/control frame 710 can comprise link FEEDBACK CONTROL eight bit byte 701.
In one embodiment, not only can comprise link FEEDBACK CONTROL eight bit byte 701 in order/control frame 710, order/control frame 710 also can comprise one or two eight bit byte 702, to indicate the grouping number correctly receiving.
In one embodiment, not only can comprise link FEEDBACK CONTROL eight bit byte 701 in order/control frame 710, order/control frame 710 also can comprise one or two eight bit byte 703, to indicate the grouping number of loss.
In one embodiment, not only can comprise link FEEDBACK CONTROL eight bit byte 701 in order/control frame 710, order/control frame 710 also can comprise two eight bit bytes 704, and what received to indicate has FCS error and do not have the grouping number of HCS error.
In one embodiment, not only can comprise link FEEDBACK CONTROL eight bit byte 701 in order/control frame 710, order/control frame 710 also can comprise two eight bit bytes 705, to indicate the expectation recipient's who is sent to command frame grouping number.
In one embodiment, not only can comprise link FEEDBACK CONTROL eight bit byte 701 in order/control frame 710, order/control frame 710 also can comprise one or two eight bit byte 706, to indicate the size with the measurement window of microsecond or milli seconds counter.
In one embodiment, not only can comprise link FEEDBACK CONTROL eight bit byte 701 in order/control frame 710, order/control frame 710 also can comprise an eight bit byte 707, to indicate LQI or SNR.
In one embodiment, link FEEDBACK CONTROL eight bit byte 701 can have the form as shown in frame 720.In one embodiment, the position 2～position 7 708 of link FEEDBACK CONTROL eight bit byte 701 can be reserved.In one embodiment, position 1 709 can be used for instruction and whether comprise other eight bit bytes after order/control frame 710 link FEEDBACK CONTROL eight bit byte 701, and described other eight bit bytes are such as eight bit byte 702 and/or eight bit byte 703 and/or eight bit byte 704 and/or eight bit byte 705 and/or eight bit byte 706 and/or eight bit byte 707.In one embodiment, to can be used for directive command/control frame 710 are the link feedback request frame (Data Transmission Feature request message) being sent by transmitter or the link being sent by receiver feedback answer frames (Data Transmission Feature response message) in position 0 711.In one embodiment, position 0 711 can be made as 0, to indicate this order/control frame as link feedback request frame.In one embodiment, position 0 711 can be made as 1, to indicate this order/control frame as link feedback answer frame.
In one embodiment, link FEEDBACK CONTROL eight bit byte 701 can have the form as shown in frame 730.In one embodiment, the position 3～position 7712 of link FEEDBACK CONTROL eight bit byte 701 can be reserved.In one embodiment, position 2 713 can be used for instruction and whether comprise other eight bit bytes after order/control frame 710 link FEEDBACK CONTROL eight bit byte 701, and described other eight bit bytes are such as eight bit byte 702 and/or eight bit byte 703 and/or eight bit byte 704 and/or eight bit byte 705 and/or eight bit byte 706.In one embodiment, position 1 714 can be used for whether comprising in directive command/control frame 710 eight bit byte 707.In one embodiment, to can be used for indicating this order/control frame be that link feedback request frame (Data Transmission Feature request message) or link feedback is answered frame (Data Transmission Feature response message) in position 0 715.In one embodiment, position 0 715 can be made as 0, to indicate this order/control frame as link feedback request frame.In one embodiment, position 0 715 can be made as 1, to indicate this order/control frame as link feedback answer frame.
In one embodiment, each position of the position 3～position 7 712 of link FEEDBACK CONTROL eight bit byte 701 can indicate respectively in order/control frame 710, after link FEEDBACK CONTROL eight bit byte 701, whether to comprise in eight bit byte 702, eight bit byte 703, eight bit byte 704, eight bit byte 705 and eight bit byte 706.
In one embodiment, often ' x ' μ s once or aperiodicity ground comprises order/control frame (payload as shown in form 710) for transmitter, once and receive orders/control frame, after being for example the fixing period of SIFS (or after a while), receiver can be made answer (transmitter node also can provide feedback to receiver node) with order/control frame.
Embodiment shown in Fig. 7 is similar to the embodiment shown in Fig. 5, but also allows feedback information to comprise the received grouping number with error, the grouping number of loss (using serial number and/or fragment number to determine), be sent to the recipient's of command frame grouping number and measurement window (measuring the microsecond/millisecond number spending).
Fig. 8 represents the order/control frame payload format 800 according to an embodiment.
In one embodiment, order/control frame of being sent by transmitter (link feedback request frame, i.e. Data Transmission Feature request message) can have the form as shown in frame 810.In one embodiment, order/control frame of being sent in response to link feedback request frame by receiver (link feedback is answered frame, i.e. Data Transmission Feature response message) can have the form as shown in frame 810, but does not have eight bit byte 802.
In one embodiment, order/control frame 810 can comprise link FEEDBACK CONTROL field 801.
In one embodiment, in the order/control frame 810 being sent by transmitter, not only comprise link FEEDBACK CONTROL field 801, order/control frame 810 also can comprise more than two eight bit byte 802, should be to the unit address of the receiver being responded by order/control frame that transmitter was sent to indicate.The order that the unit address of described receiver is mentioned in list 802 is the order that these receivers should respond with response link feedback command frame.
Be addressed in the link feedback command frame 810 having sent of single receiver (unicast address) and should do not comprise device list field 802.If this link feedback command frame is sent to multiple receivers or exceedes a receiver (multicast address), in the link feedback command frame 810 having sent, should comprise device list field 802.
In one embodiment, link FEEDBACK CONTROL field 801 can have the form as shown in 820.In one embodiment, the position 11～position 15 805 of link FEEDBACK CONTROL field 801 can be reserved.In one embodiment, the position 7～position 10 806 of link FEEDBACK CONTROL field 801 can be used for the data rate that instruction is advised.In one embodiment, position 3～position 6 807 can be used for the transmit power levels variation that instruction is advised.
If dispensing device request comprises link information field 803 at any link feedback command frame of the link feedback command frame 810 in response to having sent, link information field request/comprise that position 808 should be set as 1 (ONE) by the dispensing device of link feedback command frame 810, the dispensing device of its link feedback command frame 810 is set as 1 by its link feedback request position 811.If comprised link information field 803 at the link feedback command frame 810 having sent, link information field request/comprise that position 808 should be set as 1 by the dispensing device of link feedback command frame 810, its link feedback request position 811 is set as 0 (ZERO) by the dispensing device of its link feedback command frame 810.In every other situation, the dispensing device of link feedback command frame 810 should be set as 0 by this link information field request/comprise position 808.
If dispensing device request comprises LQI field 804 at any link feedback command frame of the link feedback command frame 810 in response to having sent, LQI field request/comprise that position 809 should be set as 1 by the dispensing device of link feedback command frame 810, the dispensing device of its link feedback command frame 810 is set as 1 by its link feedback request position 811.If comprised LQI field 804 at the link feedback command frame 810 having sent, LQI field request/comprise that position 809 should be made as 1 by the dispensing device of link feedback command frame 810, the dispensing device of its link feedback command frame 810 is made as 0 by its link feedback request position 811.In every other situation, the dispensing device of link feedback command frame 810 should be set as 0 by LQI field request/comprise position 809.
If dispensing device is request link feedback command frame in response to the link feedback command frame 810 having sent, link feedback request position 811 should be made as 1 by the dispensing device of link feedback command frame 810.In the link feedback command frame 810 sending at the link feedback command frame in response to having received, link feedback request position 811 should be made as 0.
In one embodiment, not only comprise link FEEDBACK CONTROL field 801 in order/control frame 810, order/control frame 810 also can comprise two eight bit bytes 804, to indicate LQI or SNR.
If be made as 1 in the link feedback command frame 810 link feedback request positions 811 that sent, eight bit byte 804 should not be included as a part for this link feedback command frame 810 having sent.
If be made as 1 in the link feedback command frame 810 link feedback request positions 811 that sent, eight bit byte 803 should not be included in this link feedback command frame 810 having sent.
In one embodiment, order/control frame 810 can comprise link information field 803.In one embodiment, link information field 803 can have the form as shown in 830.In one embodiment, the grouping number that eight bit byte 812 instructions are lost.In one embodiment, eight bit byte 813 is indicated and received is had FCS error and do not have the grouping number of HCS error.In one embodiment, eight bit byte 814 is indicated the grouping number correctly receiving.
In one embodiment, eight bit byte 815 instructions are sent to the expectation recipient's of command frame grouping number.
In one embodiment, eight bit byte 816 is with the size of microsecond or millisecond number instruction measurement window.
After receiving received link feedback command frame, the device of receiver feedback command frame 810 will respond with link feedback command frame 810SIFS or any fixing period, and described link feedback command frame 810 is addressed to unicast address (single receiver) and link feedback request position 811 is made as 1 device.The link feedback command frame 810 that this device should send at the link feedback command frame in response to having received comprises advised transmit power levels variation 807 and data rate 806.If in the link feedback command frame having received, LQI field request/comprise that position 809 is made as 1, the link feedback command frame 810 that this device should send at the link feedback command frame in response to this reception comprises LQI field 804.If in the link feedback command frame having received, link information field request/comprise that position 808 is made as 1, the link feedback command frame 810 that this device should send at the link feedback command frame having received in response to this comprises link information field 803.
In the time receiving the link feedback command frame 810 that is sent to multicast address (multiple receiver), device should respond with response link feedback command frame 810, and described link feedback command frame 810 comprises its unit address in device list 802.The link feedback command frame 810 that this device should send at the link feedback command frame in response to having received comprises advised transmit power levels variation 807 and data rate 806.If in the link feedback command frame having received, LQI field request/comprise that position 809 is made as 1, the response link feedback command frame 810 that this device should send at the link feedback command frame having received in response to this comprises LQI field 804.If in the link feedback command frame having received, link information field request/comprise that position 808 is made as 1, the response link feedback command frame 810 that this device should send at the link feedback command frame having received in response to this comprises link information field 803.This device should send response link feedback command frame after certain delay, and described delay is given as:
Send time=pSIFS+pSlotTime+ (positional value in device list) × (the response link feedback command frame duration+pSIFS) of response
The time that sends response calculates in the time that the reception of the link feedback command frame that received finishes.In link feedback command frame, the probable value of the position in device list is in scope [0, N-1] (closed interval).
Duration value in the link feedback command frame having sent should be contained this link feedback command frame and the link feedback command frame in response to all expections of this link feedback command frame having sent.The response link feedback command frame sending for the cast link feedback command frame in response to having received, duration field is given by following equation institute:
Duration value-(the link feedback command frame body transmission time+pSIFS having received)-response link feedback command frame transmission time+response link feedback command frame body transmission time of the link feedback command frame of duration=received
The response link feedback command frame sending for the multicast link feedback command frame in response to having received, duration field is given by following equation institute:
Duration value-(link feedback command frame body transmission time+pSIFS+pSlotTime+ (position in the list in the link feedback command frame having received) × (the response link feedback command frame transmission time+pSIFS) having received)-response link feedback command frame transmission time+response link feedback command frame body transmission time in the link feedback command frame of duration=received
In a word, the embodiment as shown in Fig. 3, Fig. 5, Fig. 7 and Fig. 8 is based on order/control frame, and permission is carried out speed and power control in sender side.The scheme (Fig. 3～Fig. 8) proposing meets the needs of the channel with low coherence time.Variable ' x ' can be determined by implementer.Conventionally,, based on the first pre-test about SNR or packet error rate as from receiver fed back, can determine variable ' x ' in sender side.Large I from the payload of the frame proposing of sender side is low to moderate 1 or 2 eight bit byte, and from receiver-side can be up to 3 or 4 eight bit bytes (for the embodiment shown in Fig. 3～Fig. 6) or up to 2 to 14 eight bit bytes (for the embodiment shown in Fig. 7 and Fig. 8).Actual speed rate and power control strategy at transmitter place can be left implementer's selection (can obtain multiple speed and power control strategy based on SNR/LQI from data in literature) for.The scheme proposing can be applicable to the future version of IEEE802.11MAC, IEEE 802.15.3b MAC, IEEE 802.15.3c MAC, IEEE 802.15.4MAC and other relevant MAC agreements.
Fig. 9 represents the communicator 900 according to an embodiment.
In one embodiment, communicator 900 comprises transtation mission circuit 901, receiving circuit 902 and definite circuit 903.
In one embodiment, transtation mission circuit 901 is configured to, in superframe, multiple frames and multiple Data Transmission Feature request message are sent to receiver, Data Transmission Feature information with request from receiver, wherein Data Transmission Feature request message is order/control message.
In one embodiment, receiving circuit 902 is configured to receive the multiple Data Transmission Feature response messages in response to Data Transmission Feature request message from receiver in this superframe, described Data Transmission Feature response message comprises Data Transmission Feature information, and wherein Data Transmission Feature response message is order/control message.
In one embodiment, determine that circuit 903 is configured to determine at least one Data Transmission Feature from Data Transmission Feature information.
In one embodiment, a kind of computer program is provided, wherein in the time carrying out this computer program by computer, this computer program makes computer carry out a kind of method for specified data transmission characteristic, wherein data are transmitted at least one superframe, each superframe is configured to transmit multiple frames, the method comprises: in this superframe, multiple Data Transmission Feature request messages are sent to receiver, Data Transmission Feature information with request from receiver, wherein Data Transmission Feature request message is order/control message; In this superframe, receive the multiple Data Transmission Feature response messages in response to Data Transmission Feature request message from receiver, described Data Transmission Feature response message comprises Data Transmission Feature information, and wherein Data Transmission Feature response message is order/control message; From this Data Transmission Feature information, determine at least one Data Transmission Feature.
In one embodiment, provide that a kind of utility command/control frame is to realize the method for link feedback between two devices, the method comprises: allow the every mistake of transmitter ' x ' μ s (or every ' x ' μ s at least one times or aperiodicity ground) and/or comprise order/control frame in the beginning of frame exchange; Once receive orders/and control frame, after being for example the fixing period of SIFS, allow receiver to make answer with order/control frame.
In one embodiment, this method that realizes link feedback also comprises: allow transmitter to comprise the payload of link FEEDBACK CONTROL eight bit byte; And, allow receiver with the payload of link FEEDBACK CONTROL eight bit byte, make answer about the information of the grouping number correctly receiving and about the information of LQI/SNR.
In one embodiment, this method that realizes link feedback also comprises: allow transmitter to comprise the payload of link FEEDBACK CONTROL eight bit byte; And the information that allows receiver to change with the payload of link FEEDBACK CONTROL eight bit byte, about the information of data rate and about transmit power levels is made answer.
In one embodiment, this method that realizes link feedback also comprises: allow to carry out the exchange of link feedback between transmitter and receiver; Allow transmitter comprise the payload of link FEEDBACK CONTROL eight bit byte, about the information of the grouping number correctly receiving and about the information of LQI/SNR; And, allow receiver with the payload of link FEEDBACK CONTROL eight bit byte, make answer about the information of the grouping number correctly receiving and about the information of LQI/SNR.
In one embodiment, the method for this permission link feedback also comprises: allow to carry out the exchange of link feedback between transmitter and receiver; The information that allows transmitter to comprise the payload of link FEEDBACK CONTROL eight bit byte, change about the information of data rate and about transmit power levels; And the information that allows receiver to change with the payload of link FEEDBACK CONTROL eight bit byte, about the information of data rate and about transmit power levels is made answer.
In one embodiment, provide a kind of method that utility command/control frame feeds back to realize link between two devices, the method comprises: allow every ' x ' the μ s of transmitter or aperiodicity ground transmission command/control frame; Once receive orders/and control frame, after being for example the fixing period of SIFS, allow receiver to make answer with order/control frame; Allow to carry out the exchange of link feedback between transmitter and receiver; Allow transmitter comprise the payload of link FEEDBACK CONTROL eight bit byte, about the information of the received grouping number with error, about the information of the grouping number of losing, about be sent to command frame recipient grouping number information, about the information of measurement window, about the information of the grouping number correctly receiving and about the information of SNR/LQI; And, allow receiver with the payload of link FEEDBACK CONTROL eight bit byte, about the information of the grouping number with error being received, about the information of the grouping number of losing, about be sent to command frame recipient grouping number information, about the information of measurement window, make answer about the information of the grouping number correctly receiving and about the information of SNR/LQI.
Although the present invention illustrates particularly and describes with reference to specific embodiment, but those skilled in the art should understand, in the case of not departing from as the scope of the present invention by appending claims defined, can make the various variations in form and details.Scope of the present invention is therefore indicated by appending claims, and intention comprise the equivalent that falls into claims meaning and scope in all changes.
In this file, quote the following files:
[1].Standard?ECMA-368，High?Rate?Ultra?Wideband?PHY?and?MAC?Standard，2
nd?Edition?/December?2007.
[2].WiMedia?MAC?Release?1.0，Distributed?Medium?Access?Control(MAC)for?Wireless?Networks，Dec.2005，
http://www.wimedia.org/en/index.asp.
[3] .Karsten Schoo etc., " Prompt Rate Adaptation in WiMedia ConsideringTime Variant UWB Channels, " in Proc.PIMRC 2007.
[4].Wireless?Medium?Access?Control(MAC)and?Physical?Layer(PHY)Specifications?for?High?Rate?Wireless?Personal?Area?Networks(WPANs)，IEEE?802.15.3b，2005.
[5] .G.J.Foschini and Z.Miljanic, " A simple distributed autonomous power control algorithm and its convergence, " IEEE Trans.Veh.Technol., vol.42, no.4, pp.641-646, Nov.1993.
[6].J.Zander，“Distributed?cochannel?interference?control?in?cellular?radiosystems，”IEEE?Trans.Veh.Technol.，vol.41，no.1，pp.305-311，Mar.1992.
[7].D.Kim，“Rate?regulated?power?control?for?supporting?flexible?transmission?in?future?CDMA?mobile?networks，”IEEE?J.Sel.Areas?Commun.，vol.17，no.5，pp.968-977，May?1999.
[8].K.Leung，“Power?control?by?interference?predictions?for?wireless?packet?networks，”IEEE?Trans.Wireless?Commun.，vol.1，no.2，pp.256-265，Apr.2002.
Claims (17)
1. for a method for specified data transmission characteristic, wherein data are transmitted at least one superframe, and each superframe is configured to transmit multiple frames, and the method comprises:
In this superframe, send multiple Data Transmission Feature request messages, each described request message is addressed to receiver, and to ask the Data Transmission Feature information from described receiver, wherein, described Data Transmission Feature request message is order or control message;
In this superframe, receive the multiple Data Transmission Feature response messages in response to described Data Transmission Feature request message from described receiver, described Data Transmission Feature response message comprises Data Transmission Feature information, wherein, described Data Transmission Feature response message is order or control message;
Wherein, transfer of data comprises the transmission of multiple packets and by completing with communication link;
Wherein, described Data Transmission Feature information comprises the information about the grouping number of correct reception or the signal to noise ratio (snr) of the grouping number with error receiving or described communication link or link quality information (LQI); And
From described Data Transmission Feature information, determine at least one Data Transmission Feature.
The method of claim 1, wherein each described Data Transmission Feature request message comprise transmitter or from the Data Transmission Feature information of transmitter.
3. the method for claim 1, wherein in described superframe, transmit the set of two or more frames, and wherein transmission described two or more frames each set before, send at least one Data Transmission Feature request message.
4. the method for claim 1, wherein in described superframe, periodically send described Data Transmission Feature request message.
5. the method for claim 1, wherein during the each predetermined periodicity time interval in described superframe, send Data Transmission Feature request message at least one times.
6. the method for claim 1, described method is implemented by transmitter, and described transmitter and described receiver are according to the communicator of WiMedia specification.
7. the method for claim 1, wherein described Data Transmission Feature request message is MAC layer message.
8. the method for claim 1, wherein described Data Transmission Feature response message is MAC layer message.
9. the method for claim 1, wherein described Data Transmission Feature request and response message comprise the information changing for setting transmit power levels.
10. the method for claim 1, wherein in described superframe, send to aperiodicity Data Transmission Feature request message.
11. the method for claim 1, wherein described Data Transmission Feature request and response message comprise the information of the data rate for setting described transfer of data.
12. the method for claim 1, wherein, described Data Transmission Feature information also comprises the information about advised data rate, the information changing about advised transmit power levels, about the information of the grouping number of losing, about described recipient's the information of grouping number that transfers to described order or control frame, about the information of measurement window, also comprise about advised data rate, the transmitted power of advising, the grouping number with error receiving, the grouping number of losing, transfer to the described recipient's of described order or control frame grouping number, measurement window, the correct grouping number receiving and the information of signal to noise ratio (snr) or link quality information (LQI) are included in the detail in described order or control frame.
13. methods as claimed in claim 2, wherein, every mistake ' x ' μ s or every ' x ' μ s be at least one times or aperiodicity ground or at beginning transmission command or control frame or the Data Transmission Feature request message of frame exchange in described superframe for described transmitter, once and receive orders or control frame or request message, after being for example the fixing period of short interframe space (SIFS), described receiver is made answer with order or control frame or Data Transmission Feature response message.
14. the method for claim 1, wherein after receiving described Data Transmission Feature request message, and device sends Data Transmission Feature response message time in response to this Data Transmission Feature request message is given as:
PSIFS+pSlotTime+ (positional value in device list) × (the command frame duration+pSIFS of described Data Transmission Feature response message),
Wherein, pSIFS and pSlotTime have the defined value of ECMA standard.
The 15. Data Transmission Feature response messages that the method for claim 1, wherein send in response to Data Transmission Feature request message comprise the duration field with the duration value given by following formula:
Described Data Transmission Feature request message comprise time long value – (the command frame body transmission time+pSIFS of described Data Transmission Feature request message) – described in command frame body transmission time of command frame transmission time+described Data Transmission Feature response message of Data Transmission Feature response message
Wherein, pSIFS has the defined value of ECMA standard.
The 16. Data Transmission Feature response messages that the method for claim 1, wherein send in response to Data Transmission Feature request message comprise the duration field with the duration value given by following formula:
Described Data Transmission Feature request message comprise time long value – (command frame body transmission time+pSIFS+pSlotTime+ (positional value in the list in described Data Transmission Feature request message) × (the command frame transmission time+pSIFS of described Data Transmission Feature response message) of described Data Transmission Feature request message) – described in command frame body transmission time of command frame transmission time+described Data Transmission Feature response message of Data Transmission Feature response message
Wherein, pSIFS and pSlotTime have the defined value of ECMA standard.
17. 1 kinds of communicators, it comprises:
Transtation mission circuit, it is configured to send the multiple Data Transmission Feature request messages in this superframe at least one superframe, each superframe is configured to transmit multiple frames, each described request message is addressed to receiver, Data Transmission Feature information with request from this receiver, wherein said Data Transmission Feature request message is order or control message;
Receiving circuit, it is configured to receive the multiple Data Transmission Feature response messages in response to described Data Transmission Feature request message from described receiver in this superframe, described Data Transmission Feature response message comprises Data Transmission Feature information, and wherein said Data Transmission Feature response message is order or control message;
Determine circuit, it is configured to determine at least one Data Transmission Feature from described Data Transmission Feature information;
Wherein, transfer of data comprises the transmission of multiple packets and by completing with communication link;
Wherein, described Data Transmission Feature information comprises the information about the grouping number of correct reception or the signal to noise ratio (snr) of the grouping number with error receiving or described communication link or link quality information (LQI).
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| PCT/SG2008/000483 WO2009088364A1 (en) | 2008-01-08 | 2008-12-16 | A method, a device and a computer program product for determining a data transmission characteristic |
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| US20070014273A1 (en) * | 2005-07-13 | 2007-01-18 | Yefim Kuperschmidt | Method, device and computer readable medium for dynamically updating transmission charactaristics |
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