CN1859050A - Device in distributed wireless personal area network and data slot allocation method - Google Patents
Device in distributed wireless personal area network and data slot allocation method Download PDFInfo
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Abstract
A data slot allocation method allowing a plurality of devices in a wireless personal area network (WPAN) to satisfy the required QoS condition for the data stream transmission. The method includes allocating a specific number of data slots of a superframe to the plurality of the devices based on the QoS information; additionally allocating a certain number of data slots to a first device when the first device transmitting a data stream is allocated data slots less than a number of required data slots for the data stream transmission; and reserving the additional data slots for the first device by reducing a number of data slots to be allocated to the other devices, excluding the first device. Accordingly, the data slots can be fairly distributed to the devices.
Description
The application require on October 13rd, 2004 United States Patent and Trademark Office submit to 60/617, the priority of the interests of No. 671 U.S. Provisional Applications power and the 2005-37119 korean patent application submitted in Korea S Department of Intellectual Property on May 3rd, 2005, this application is disclosed in this for reference.
Technical field
The present invention relates to a kind of device and a kind of method that is used for the data slot distribution of in distributed wireless personal area network (WPAN), using the data slot transmitting data stream that distributes.More particularly, the present invention relates to a kind of quantity of considering the data slot that neighboring devices is required regulate the data slot that will be assigned with quantity device and a kind ofly be used for the method that data slot distributes.
Background technology
Compare with Local Area Network that is widely known by the people or wide area network (WAN), individual territory net (PAN) is the network that is had by the individual in about 10 meters scopes.For convenience of the user, the device that is had by the individual interconnects with building network.Wireless Personal Network (WPAN) is realized existing PAN by wireless connections.
Institute of Electrical and Electronics Engineers (IEEE) 802.15 working groups developed be used for short-distance radio network WPAN with standardization PAN and realize PAN.IEEE 802.15 standards have four task groups.More particularly, the well-known Bluetooth technology of IEEE 802.15.1 standardization, and IEEE 802.15.3 and IEEE802.15.3a standardization two-forty WPAN.In addition, 802.15.4 has another name called ZigBee, the low rate WPAN that standardization 250Kbps is following.In WPAN, communication media is shared by each device among the WPAN.In this, the medium access that needs medium access control (MAC) to come control device.
Can be designed for the MAC of WPAN with two kinds of schemes: centralized solution and distributed schemes.According to centralized MAC scheme, single assembly is whole network operation is used for each device with management and control MAC.On the contrary, the distributed MAC scheme makes each install the responsibility of Sharing Management MAC.
Fig. 1 is the conceptual diagrammatic sketch according to the WPAN environment of distributed MAC scheme.In Fig. 1, stain indicating device, the transmission range of the beacon (beacon) of this device of circle indication of drawing based on this point.According to the distributed MAC scheme, for channel time reserve, synchronous or the like, work in coordination between device and share required information.WPAN environment (hereinafter, being called distributed WPAN) according to the distributed MAC scheme adopts the timing notion that is known as superframe.
Fig. 2 has described the structure of traditional superframe.
With reference to figure 2, superframe is the structure of describing in Mb-ofdm (OFDM) the draft v0.5 of alliance.Superframe comprises 256 medium access time slots (MAS).The length of superframe is 65.536ms, and the length of MAS is 256 μ s.Cycle " a10 " indication comprises the beacon period of beacon slot, and " a20 " is the cycle data that comprises MAS, and other device in the network uses described MAS to be sent to another device in this network will flow (data).Hereinafter, the MAS in beacon period is known as beacon slot, and the MAS in the cycle data is known as data slot.The data slot of specific quantity can be reserved and utilize to described device.
Information about described superframe is broadcasted in the beacon slot of the beacon period of distributing to device.The superframe information that adjacent device utilization receives in next superframe.The time started of superframe is depended on the beginning of the beacon period that is defined as time started beacon period (BPST).
In distributed WPAN, the superframe of the traditional device that shows as Fig. 2 is assigned to the data slot of specific quantity, to satisfy service quality (QoS) requirement.Specifically, described device is by coming transmission QoS information element (IE) such as the Common Control Channel of the beacon slot in the superframe.QoS IE record is about the information of following content: specify stream index, the data flow of the data flow that transmits from described device to transmit the QoS (RMAS) of required needs and be used for the QoS (DMAS) of the expectation of optimize transmissions data flow.
If device is according to identical communication protocol mutual communication, then modulation treatment, demodulation process and data compression process are also identical.Therefore, the quantity of the degree of QoS and MAS is proportional.In this article, the reservation of QoS or distribution can mean reservation or the distribution of the MAS of specific quantity.Therefore, can use the quantity of the quantity of the data slot that needs and desired data time slot and the QoS that need not need and the QoS of expectation come transmission QoS IE.
Receive QoS IE when one, the information that the device among the distributed WPAN just will comprise from the QoSIE that another device receives is recorded in their memory.Next, the quantity or the QoS of the described device data slot that will distribute from next superframe based on the information calculations of record.Because single assembly needs the data slot of needs of varying number and the desired data time slot of varying number, therefore, need a kind of solution of distributing described data slot effectively.
For example, if device based on the reasonable quantity ground distribute data time slot of the device of transmission QoS IE, then data slot can be assigned with as follows.
[table 1]
| Stream index | RMAS | DMAS | The MAS of service |
| A(DEV 1→2) | 20MAS | 40MAS | 25MAS |
| B(DEV 1→2) | 15MAS | 30MAS | 25MAS |
| C(DEV 3→1) | 40MAS | 80MAS | 25MAS |
| D(DEV 4→3) | 20MAS | 40MAS | 25MAS |
In table 1, when data flow A, B, C and D in the network environment that comprises four devices altogether are transmitted and the sum of MAS when being 100,25 MAS are assigned to from each stream of each device transmission.The RMAS of data flow A, B and D is respectively 20,15 and 20.The DMAS of data flow A, B and D is respectively 40,30 and 40.Since by 25 MAS of reasonable distribution on the RMAS under the DMAS of each data flow but in each data flow, so data flow A, B and D can be transmitted.For from installing the data flow C of 3 auto levelizers 1, but RMAS is 40 MAS only is assigned with 25 MAS.Therefore, can not transmitting data stream C.As mentioned above, under traditional distributed WPAN, data slot does not have to be assigned with according to the QoS of the expectation of the device that is used to be equipped with.Therefore, can not realize the reasonable distribution of data slot.
Summary of the invention
The present invention has been provided to solve above-mentioned and other problem and the shortcoming that occurs in traditional layout, an aspect of of the present present invention is to provide a kind of and comes distribute data time slot reasonably and effectively utilize the device of total data time slot and a kind ofly be used for the method that data slot distributes by the quantity of calculating the data slot that will distribute from next superframe with reference to the quantity of the required data slot of adjacent device.
In order to realize the above-mentioned aspect of exemplary embodiment of the present invention, a kind of distribution method of data slot of the multiple arrangement that is used for distributed wireless personal area network (WPAN) is provided, has comprised: at described multiple arrangement by the Common Control Channel transmission and receive required service quality (QoS) information of transmitting data stream; Based on described QoS information the data slot of specific quantity is distributed to described multiple arrangement; When the data slot that is assigned with when first device of transmitting data stream is less than the quantity of data slot of the needs that are used for data flow transmission, additionally distribute to the data slot of the described first device specific quantity; With by reduce the quantity will be assigned to the data slot that removes other device described first device with certain proportion, be that described first device is reserved the data slot that adds.
QoS information can comprise at least one in the quantity of the quantity of data slot of stream index, needs and desired data time slot.
Described data slot allocation method can also comprise: calculate the QoS satisfaction at other device.Described other device can by with the QoS satisfaction of calculating pro rata the calculated data time slot quantity and deduct the quantity of described calculating from the quantity of the data slot that distributes by current superframe, coming is that described first device is reserved described additional data slot.
Described data slot allocation method can also comprise: add described distributed WPAN at second device; The sum of the data slot of the needs of the stream that acquisition transmits on described distributed WPAN also deducts the sum of described acquisition from the sum of data slot; With when under the result of quantity at described subtraction of data slot of the needs of described second device, the data slot of specific quantity is distributed to described second device.
According to a further aspect in the invention, a kind of data slot allocation method that is used for the device of distributed wireless personal area network (WPAN) comprises: at least one from the quantity of the quantity of the data slot of adjacent device receiving data stream index, needs, desired data time slot; Determine whether to exist in adjacent device first device, described first device is with the data slot transport stream of the distribution of the quantity of data slot less than desirable; When existing described first to install, calculating is reduced to the quantity that is lower than from the data slot of current superframe distribution from the quantity of the data slot that next superframe distributes.
Described calculating can comprise from the step of the quantity of the data slot of next superframe distribution: calculation services quality (QoS) satisfaction; With the QoS satisfaction quantity of calculated data time slot pro rata; With the quantity that from the quantity of the data slot that distributes from present frame, deducts the data slot of described calculating.
According to a further aspect in the invention, the device of operation comprises in distributed wireless personal area network (WPAN): communications portion receives at least one service quality (QoS) information the quantity of the quantity of the data slot that comprises stream index, needs and desired data time slot from adjacent device; Determining section determines whether to exist first device in adjacent device, described first device is assigned to the quantity data time slot of data slot less than desirable; And controller, when there being described first when device, the quantity of the data slot that calculating will distribute from next superframe is reduced to the quantity that is lower than the data slot that distributes from current superframe.
Described controller can calculate the QoS satisfaction, and by with the QoS satisfaction of calculating pro rata the calculated data time slot quantity and calculate the quantity of the data slot that will distribute from next superframe from the quantity that the quantity of the data slot that distributes from present frame deducts the data slot of described calculating.
Described communications portion can receive described QoS information by Common Control Channel.
Description of drawings
By below in conjunction with accompanying drawing exemplary embodiment being described, above-mentioned and/or others of the present invention will become clear and be more readily understood, wherein:
Fig. 1 is the conceptual diagram of the structure of distributed wireless personal area network (WPAN);
Fig. 2 is the conceptual diagram of the superframe that uses in distributed WPAN;
Fig. 3 is the conceptual diagram of distributed WPAN according to an exemplary embodiment of the present invention;
Fig. 4 explains the flow chart of the data slot allocation method in distributed WPAN according to an exemplary embodiment of the present invention; With
Fig. 5 is the block diagram of the device in distributed WPAN according to an exemplary embodiment of the present invention.
Embodiment
Referring now to accompanying drawing certain exemplary embodiments of the present invention is described in more detail.
In ensuing description, the identical label in the different accompanying drawings is represented identical part all the time.The content that defines in description such as detailed structure and component representation, is used to help to understand the present invention.In addition, because known function or structure will blur the present invention on unnecessary details, therefore it no longer is described in detail.
Fig. 3 is that data flow according to an exemplary embodiment of the present is shown is the conceptual diagram that how is transmitted between the device in distributed wireless personal area network (WPAN).In Fig. 3, device 1 (DEV1) auto levelizer 4 (DEV4) transmitting data stream A is to data flow D.Specifically, DEV1 is transferred to DEV2 with data flow A and B, and DEV3 is transferred to DEV1 with data flow C, and DEV4 is transferred to DEV3 with data flow D.The stream that single assembly transmits for it is assigned to certain number according to time slot in superframe.In this case, if all device be assigned to be used for data flow transmission need the quantity data time slot, then individual other device may not can be assigned to the data slot of the required needs of data flow transmission.
According to exemplary embodiment of the present invention, if in Fig. 3, there is the individual device of the data slot of the needs that do not have distribution, then other device reduces the data slot of their data flow that will be assigned to them, thereby the quantity of the data slot that distributes can satisfy the quantity of data slot of the needs of described individual device.
For this reason, the device among Fig. 3 transmits and receives their service quality (QoS) by Common Control Channel.QoS information belongs to the QoS that guarantees data flow by from described device information transmitted.
Specifically, QoS information can be the stream index of specifying the data flow that will be transmitted, the quantity of the desired data time slot of the quantity of the data slot that is used for the required needs of data flow transmission and optimize transmissions data flow.
Suppose that each device has the identical message transmission rate of following identical communication protocol, then QoS and MAS are proportional.Therefore, QoS information can be stream index, the QoS that needs and the QoS of expectation.In exemplary embodiment of the present invention, suppose that each device has identical transmission rate, that is to say, follow identical communication protocol, calculate the QoS that will be assigned to described device pro rata with the QoS information of other device, just, the quantity of calculated data time slot.Hereinafter, be described based on MAS with respect to whole devices.
For example, suppose as shown in table 1 being assigned with of data slot of current superframe, then DEV3 can not transmitting data stream C.In order to prevent this situation, the data slot of specific quantity is additionally distributed to the data slot of DEV3 need to obtain.The data slot of DEV1,2 and 4 their distribution of minimizing is so that DEV3 obtains additional data slot.
In order to make the additional data slot of DEV3 acquisition, DEV1,2 and 4 satisfactions based on equation 1 their QoS ratio of calculating.
[equation 1]
In equation 1, n is a Hyper Frame Number, and SOQ (n) is the satisfaction at the QoS of n superframe, and R (n) is the quantity at the data slot of the needs of n superframe, D (n) is the quantity at the desired data time slot of n superframe, and S (n) is the quantity from the data slot of n superframe distribution.
Attention is used for the additional data slot of DEV3 in table 1 quantity is 15 MAS.DEV1,2 and 4 is from the QoS satisfaction of additional 15 MAS that are used for DEV3 and the calculating quantity of calculated data time slot pro rata, and deducts the quantity of calculating from the quantity of the data slot of the distribution of current superframe.
For example, for the DEV1 in the table 1, its QoS satisfaction is (25-20)/(40-20)=1/4.15 additional MAS multiply by 1/4 equal 3.75 and rounding be 4.DEV1 deducts 4 MAS from the data slot of the distribution of current superframe.Just, DEV1 calculating is 21 MAS from the quantity of the data slot of next superframe distribution.The quantity of the data slot of regulating is as shown in table 2.
[table 2]
| Stream index | RMAS | DMAS | The MAS of service | The MAS that distributes |
| A(DEV 1→2) | 20MAS | 40MAS | 25MAS | 21MAS |
| B(DEV 1→2) | 15MAS | 30MAS | 25MAS | 18MAS |
| C(DEV 3→1) | 40MAS | 80MAS | 25MAS | 40MAS |
| D(DEV 4→3) | 20MAS | 40MAS | 25MAS | 21MAS |
The calculating of data slot for convenience, the sum of data slot is made as 100 in table 2.In table 2,20 MAS that data flow A and D need be used to transmit.Therefore, 21 of distribution MAS enough are used for transmission.18 MAS also are enough for the data stream B of 15 MAS of needs.
As mentioned above, with respect to data flow A, B and D, the quantity of the distribute data time slot by regulating next superframe, 15 MAS can additionally be distributed to data flow C.As a result, DEV3 is assigned to the quantity of 40 MAS with the data slot of satisfying the demand, and DEV3 transmitting data stream C successfully.
Fig. 4 explains the flow chart of data slot allocation method in distributed WPAN according to an exemplary embodiment of the present invention.With reference to figure 4, the device under this network environment is checked the QoS information (S410) of neighboring devices.
Described device determines whether to exist the neighboring devices (S420) of coming transport stream with the data slot of the distribution of data slot less than desirable.If the data slot that first device is assigned to the data slot that is less than the needs that are used for first transmission (promptly, the minimum data time slot that uses), then will be assigned to the quantity of the data slot of described first device, just, be increased in next frame for first data slot and the data slot that needs is provided (S430).
Next, described device is by calculating QoS satisfaction (S440) in the quantity substitution equation 1 of quantity, its quantity of desired data time slot and the data slot that distributes of data slot of needs with it in current superframe.
The quantity of data slot is to be reduced (S450) pro rata with the QoS satisfaction.In order to be the additional data slot of first-class reservation, other except that first first device of transmission installs from the data slot of the stream that is used for them to be given up and the proportional data slot of QoS satisfaction that calculates.
For this reason, based on common algorithm expression formula equation 1 just, described device uses the QoS information of the neighboring devices that receives by Common Control Channel to calculate their data slot.Therefore, the data slot of superframe can be distributed effectively.
Simultaneously, if the second new device is attempted visit this distributed WPAN, then second device provides its stream index, the quantity of data slot of needs and the quantity of desired data time slot in beacon period.The visit of second device depends on whether the data slot of distributing to second device surpasses the quantity of the data slot of needs.For example, the value that obtains when the sum of the data slot that deducts current needs at whole stream that distributed WPAN transmits by the sum from data slot is under the quantity of the data slot of the needs of second device time, the visit failure of second device.Therefore, second device is regained its data slot request for allocation.On the contrary, if subtraction result surpasses the quantity of the data slot that needs, the then visit of the second device achieving success.In this case, the quantity regulating of the single assembly data slot that will distribute from next superframe is the quantity of data slot of its needs.
Fig. 5 is the block diagram that installs according to an exemplary embodiment of the present invention.Described device is operated under distributed WPAN.With reference to figure 5, described device comprises communications portion 110, determining section 130, controller 140 and memory 120.
Communications portion 110 is communicated by letter with neighboring devices according to Institute of Electrical and Electronics Engineers (IEEE) 802.15 standards.Communications portion 110 receives QoS information by Common Control Channel from other device.For superframe, beacon period can be used as described Common Control Channel.
When determining section 130 1 receives QoS information in beacon period of current superframe, be less than first device of data slot of its needs with regard to the data slot of determining in described device, whether to exist distribution.
Controller 140 is according to the quantity of determining to calculate the data slot that will distribute at next superframe of determining section 130.When determining to exist described first when device in determining section 130, controller 140 calculates the quantity of the data slot that distributes from next superframe, and the quantity of the described data slot that distributes from next superframe is lower than the quantity of the data slot that distributes from current superframe.As a result, additional data slot is for being reserved by the stream of the first device transmission, thereby described first device can obtain the data slot that needs.
The QoS information that memory 120 records receive from described device.The quantity of the data slot that distributes in current superframe can be recorded together.The tentation data time slot is reasonably distributed in current superframe, and then memory 120 can write down information as shown in table 1.
Based on the information of record in the memory as shown in table 1 120, determining section 130 determines that the data flow C of DEV3 is assigned to 25 MAS, and these 25 MAS are lower than 40 MAS of data slot that need.
Next, controller 140 quantity regulating that will distribute to the data slot of data flow C from next superframe is 40 MAS.In order to be additional 15 MAS (40-25=15) of data flow C reservation, controller 140 is calculated as the quantity that is lower than the data slot that distributes in present frame with the quantity of described data slot.Specifically, if described device is the DEV1 in the table 1, then controller 140 calculating are 21 MAS from the quantity of the data slot of next superframe distribution.The quantity of the data slot that calculates is assigned with from next superframe.According to the characteristics of distributed network by with the distribution of carrying out data slot alternately of other device.More particularly, when regulating the quantity of the data slot that will distribute from next superframe, controller 140 broadcast beacon signals, described beacon signal had the quantity data time slot allocation of adjusting and are assigned to data slot to the neighboring devices request in beacon period.As a result, the DEV3 in the table 1 can come transmitting data stream C with the data slot of a plurality of distribution of as required data slot.
According to above-mentioned introduction, if there is the device of the data slot that does not have needs, then other device is regulated the data slot of their distribution.Therefore, the device under distributed WPAN can use the total data time slot effectively and can realize the reasonable distribution of data slot.
Although shown and described some exemplary embodiments of general plotting of the present invention, but it should be appreciated by those skilled in the art, under the situation of principle that does not break away from general plotting of the present invention and spirit, can change these exemplary embodiments, the scope of general plotting of the present invention is limited by claim and equivalent thereof.
Claims (10)
1, a kind of data slot allocation method that is used for the multiple arrangement of distributed wireless personal area network, described method comprises:
By Common Control Channel transmission and the required quality of service information of reception transmitting data stream, the data slot of first specific quantity is distributed to described multiple arrangement at described multiple arrangement based on described quality of service information;
When the data slot that is assigned with when first device of transmission one of described data flow is less than the quantity of data slot of the needs that are used for described data flow transmission, additionally the data slot of second specific quantity is distributed to described first and installed; With
By reducing the quantity of the data slot that will be assigned to other device, reserve the data slot of additional allocation for described first device.
2, data slot allocation method as claimed in claim 1, wherein, described quality of service information comprises at least one in the quantity of the quantity of data slot of stream index, needs and desired data time slot.
3, data slot allocation method as claimed in claim 2 also comprises:
Install based on equation calculation services quality satisfaction at other:
Wherein, n is a Hyper Frame Number, and SOQ (n) is the service quality satisfaction at the n superframe, and R (n) is the quantity at the data slot of the needs of n superframe, D (n) is the quantity at the desired data time slot of n superframe, and S (n) is the quantity from the data slot of n superframe distribution.
4, data slot allocation method as claimed in claim 3, wherein, described other device is by calculating the data slot of described second specific quantity pro rata with the service quality satisfaction of calculating, and deduct the data slot of second specific quantity of described calculating from the quantity of the data slot that distributes from current superframe, coming is that described first device is reserved the described data slot that is used for additional allocation.
5, data slot allocation method as claimed in claim 4 also comprises:
Add described distributed wireless personal area network at second device;
The quantity of the data slot of the needs of the stream that acquisition transmits on described distributed wireless personal area network, and deduct the quantity of data slot of the needs of described acquisition from the sum of data slot; With
When the quantity of data slot of the needs of described second device be less than described subtraction as a result the time, the data slot of the 3rd specific quantity is distributed to described second device.
6, a kind of data slot allocation method that is used for the device of distributed wireless personal area network, described method comprises:
From the quantity of the quantity of adjacent device receiving data stream index, the data slot that needs, desired data time slot at least one;
Determine whether to exist in adjacent device first device, described first device is with the data slot transport stream of the distribution of the quantity of data slot less than desirable; With
When described first device is determined when existing, the quantity of the data slot that calculating will distribute from next superframe, the quantity of the described data slot that will distribute from next superframe are lower than the quantity of the data slot that distributes from current superframe.
7, data slot allocation method as claimed in claim 6, wherein, described calculating comprises from the step of the quantity of the data slot of next superframe distribution:
Based on equation calculation services quality satisfaction:
Wherein, n is a Hyper Frame Number, and SOQ (n) is the service quality satisfaction at the n superframe, and R (n) is the quantity at the data slot of the needs of n superframe, D (n) is the quantity at the desired data time slot of n superframe, and S (n) is the quantity from the data slot of n superframe distribution;
Calculate pro rata from the quantity of the data slot of next superframe distribution with described service quality satisfaction; With
Deduct the quantity of the data slot of described calculating from the quantity of the data slot that distributes from present frame.
8, a kind of device of operating in distributed wireless personal area network comprises:
Communications portion receives at least one quality of service information the quantity of the quantity of the data slot that comprises stream index, needs and desired data time slot from adjacent device;
Determining section determines whether to exist first device in adjacent device, described first device is assigned to the quantity data time slot of data slot less than desirable; With
Controller, when described first device was determined, the quantity of the data slot that calculating will distribute from next superframe, the quantity of the described data slot that will distribute from next superframe were lower than the quantity of the data slot that distributes from current superframe.
9, device as claimed in claim 8, wherein, described controller is based on equation calculation services quality satisfaction,
Wherein, n is a Hyper Frame Number, and SOQ (n) is the service quality satisfaction at the n superframe, R (n) is the quantity at the data slot of the needs of n superframe, D (n) is the quantity at the desired data time slot of n superframe, and S (n) is the quantity from the data slot of n superframe distribution
And described controller is by calculating the quantity of the data slot that distributes from next superframe pro rata and deduct the quantity of the data slot of described calculating from the quantity of the data slot that distributes from current superframe with the service quality satisfaction of calculating, and calculates the quantity of the data slot that will distribute from next superframe.
10, device as claimed in claim 9, wherein, described communications portion receives described quality of service information by Common Control Channel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60/617,671 | 2004-10-13 | ||
| KR1020050037119A KR100597006B1 (en) | 2004-10-13 | 2005-05-03 | Device for allocating data slots in the distributed WPAN, and, method thereof |
| KR1020050037119 | 2005-05-03 |
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| CN1859050A true CN1859050A (en) | 2006-11-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008151537A1 (en) * | 2007-06-14 | 2008-12-18 | Beijing Transpacific Ip Technology Development Ltd. | Method for using an extending super-frame to transfer data in a short distance wireless individual network |
| CN101558672B (en) * | 2006-12-15 | 2013-01-02 | 索尼株式会社 | Communication system, communication device and communication method, and computer program |
-
2005
- 2005-10-12 CN CN 200510112759 patent/CN1859050A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101558672B (en) * | 2006-12-15 | 2013-01-02 | 索尼株式会社 | Communication system, communication device and communication method, and computer program |
| WO2008151537A1 (en) * | 2007-06-14 | 2008-12-18 | Beijing Transpacific Ip Technology Development Ltd. | Method for using an extending super-frame to transfer data in a short distance wireless individual network |
| US8165084B2 (en) | 2007-06-14 | 2012-04-24 | Beijing Yudong Technology Development Ltd. | Method for using an extending super-frame to transfer data in a short distance wireless personal area network |
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