CN104219031A - MAC (media access control) frame aggregation method and device - Google Patents
MAC (media access control) frame aggregation method and device Download PDFInfo
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- CN104219031A CN104219031A CN201310219192.0A CN201310219192A CN104219031A CN 104219031 A CN104219031 A CN 104219031A CN 201310219192 A CN201310219192 A CN 201310219192A CN 104219031 A CN104219031 A CN 104219031A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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Abstract
The invention discloses an MAC (media access control) frame aggregation method and device. According to the type and a destination address of MPDU (media protocol data unit), determining whether or not subject the MPDU to the aggregation and the aggregation method thereof. The MAC frame aggregation method and device has the advantage that at the premise that the conventional MPDU type and format is maintained, through the analysis of the type and the destination address of the prelude of the MPDU, the data transmission with high robustness and throughput rate is achieved.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of media interviews and control (Media Access Control, MAC) frame aggregation method and device.
Background technology
Along with the development of LED illumination technology, the communication technology based on visible ray receives publicity day by day.The same with wireless radio-frequency, the communication based on visible ray also has demand to aspects such as the robustness of transfer of data and high-throughputs.In raising throughput, existing IEEE802.15.7 uses the short distance radio communication standards (IEEE Standard for Local and metropolitan area networks-Part15.7:Short-Range Wireless Optical Communication Using Visible Light) of visible ray to propose the techniques of frame aggregation of physical layer, as shown in Figure 3, multiple physical layer service data (PSDU) 31 with identical destination address is polymerized to a physical layer protocol data unit (PPDU) 131.But, when making in this way, if certain PPDU damages, be so encapsulated in multiple polymerization PSDU in this PPDU all by damaged.Now, the probability of damage of PSDU is greater than situation during non-polymeric PSDU, and this will affect the robustness of transfer of data.
Similarly, in order to improve throughput, IEEE802.11n standard adopts polymerization technique in MAC layer, multiple MAC service data unit (MSDU) with identical destination address and access category (Access Category) is polymerized to a Medium Access Control (MAC) Protocol Data Unit (MPDU), i.e. A-MPDU (Aggregate MPDU) technology, see Fig. 2.Owing to introducing MPDU separator 412 and 422, compared with being polymerized with the physical layer frame in IEEE802.15.7 standard in Fig. 3, when to same destination address transmission data, while guarantee high-throughput, A-MPDU has good robustness.
But, in IEEE802.15.7 standard, the service quality of transfer of data is not classified (that is, not having this concept of access category), therefore cannot directly use the A-MPDU method in IEEE802.11n standard to improve throughput in the MAC layer of visible light communication.Meanwhile, IEEE802.15.7 standard does not clearly define the implication of packaged data (i.e. the payload of PSDU) in polymerization PSDU.Moreover, in Table 1 shown in in the multiple frame type of visible light communication, only have Data type frame to have requirement to high-throughput.Compared with high-throughput, the mac frame (i.e. MPDU) of other type has higher requirement to robustness.Therefore, be necessary the type of first clear and definite frame, then select the frame aggregation method meeting service quality, but still there is not corresponding technical support at present.
Table 1, IEEE802.15.7 use the MPDU type of the short distance radio communication standards definition of visible ray
| Mac frame types value | Type |
| 000 | Beacon (beacon) |
| 001 | Data (data) |
| 010 | Acknowledgment (confirmation) |
| 011 | Command (order) |
| 100 | CVD (colorful visual light modulation) |
| 101-111 | Reserved (reservation) |
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of mac frame polymerization and device, realizes the transfer of data meeting robustness and high-throughput requirement.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of mac frame polymerization, the method comprises:
According to type and the destination address of Medium Access Control (MAC) Protocol Data Unit MPDU, determine whether this MPDU carries out being polymerized and polymerization methods.
When determining whether MPDU is polymerized, determine that the MPDU being only data Data for frame type is polymerized.
When determining polymerization methods, determine the MPDU with identical destination address to be aggregated in same MPDU, the MPDU with different destination address is aggregated in different MPDU.
Described method performed before MPDU enters physical layer.
Described method is applied to visible light communication.
A kind of mac frame polyplant, this device comprises destination address acquiring unit, type acquiring unit and aggregation decisions unit; Wherein,
Described type acquiring unit, for obtaining the type of MPDU;
Described destination address acquiring unit, for obtaining the destination address of MPDU;
Described aggregation decisions unit, for according to the type of described MPDU and destination address, determines whether this MPDU carries out being polymerized and polymerization methods.
Described aggregation decisions unit when determining whether MPDU is polymerized, for: determine that the MPDU being only Data for frame type is polymerized.
Described aggregation decisions unit when determining polymerization methods, for: determine the MPDU with identical destination address to be aggregated in same MPDU, the MPDU with different destination address be aggregated in different MPDU.
Described aggregation decisions unit is used for before MPDU enters physical layer, determine whether MPDU carries out being polymerized and polymerization methods.
Described device is used for visible light communication.
Mac frame polymerization technique of the present invention, under the condition not changing existing MPDU type and form, by the type of MPDU stem and the analysis of destination address, can realize the transfer of data meeting robustness and high-throughput requirement.
Accompanying drawing explanation
Fig. 1 is frame encapsulation principle schematic in radio communication;
Fig. 2 is A-MPDU frame aggregation principle schematic in IEEE802.11n standard;
Fig. 3 is the frame aggregation principle schematic that IEEE802.15.7 uses in the short distance radio communication standards of visible ray;
Fig. 4 is the mac frame polymerization principle schematic in visible light communication;
Fig. 5 is the mac frame polymerization process figure of the embodiment of the present invention;
Fig. 6 is the mac frame polymerization process sketch of the embodiment of the present invention;
Fig. 7 is the mac frame polyplant figure of the embodiment of the present invention.
Embodiment
In general, operation as shown in Figure 6 can be performed: type and the destination address of knowing MPDU, according to type and the destination address of described MPDU, determine whether this MPDU carries out being polymerized and polymerization methods.
Specifically, from the packet of logic link control (LLC) layer, after arrival MAC, be encapsulated as MPDU, before MPDU enters physical layer, according to type and the destination address of MPDU, can determine whether this MPDU carries out being polymerized and polymerization methods.Like this, when transfer of data, just can guarantee the quality of service requirement of different types of data in robustness and high-throughput.
The visible light communication related in the present invention refers to and meets the short distance radio communication standards (IEEE Standard for Local and metropolitan area networks-Part15.7:Short-Range Wireless Optical Communication Using Visible Light) that IEEE802.15.7 uses visible ray.Certainly, the present invention in fact also can be applied to the fields such as twireless radio-frequency communication, below only for visible light communication.
The aggregate objects that the present invention relates to refers to after the encapsulation of LLC Sublayer Protocol, the MPDU generated after being sent to MAC layer.
The type of the aggregate objects that the present invention relates to uses the short distance radio communication standards of visible ray to define by IEEE802.15.7.
The destination address of the aggregate objects that the present invention relates to is used mac frame formal definition in the short distance radio communication standards of visible ray by IEEE802.15.7.
The polymerization process that the present invention relates to occurs in before MPDU enters physical layer, the mac frame polymerization namely bottom MAC layer.
The polymerization that the present invention relates to comprises the content of two aspects:
1, the judgement of frame aggregation method whether is adopted, by the type decided of MPDU;
2, when adopting polymerization, being polymerized the mode of multiple MPDU, being determined by the destination address of MPDU.Before entering physical layer, can multiple MPDU with identical destination address be aggregated in same MPDU, the MPDU with different destination address is aggregated in different MPDU.
When the present invention is used for the mac frame polymerization of visible light communication, first determine whether to adopt mac frame polymerization according to the frame type (see table 1) of MPDU, the selection of high-throughput or robustness during in order to realize transfer of data.After determining employing mac frame polymerization, be polymerized multiple MPDU with same number of frames type and destination address.Wherein, before entering physical layer, add MPDU delimiter field MD to each MPDU stem and fill field Pad, merging identical MAC stem simultaneously.The effect of MPDU delimiter field MD is that the MPDU making polymerization has robustness, and the MPDU therefore followed after bad separator still can be restored.Filling field Pad makes MPDU align on 32bit word length border.In physical layer, after these MPDU be polymerized are coupled with physical layer header, generate single PPDU.Then, then to these PPDU add lead code, for the transfer of data of physical layer.Fig. 4 describes the exemplary embodiment of the mac frame polymerization in the present invention.
In the diagram, MAC header field 410 includes destination address and the frame type information of MPDU.Wherein frame type information is as shown in table 1, uses the short distance radio communication standards of visible ray to define by IEEE802.15.7.The destination address field (DAF) of MPDU is used the destination address field (DAF) in the short distance radio communication standards of visible ray in mac frame stem to define by IEEE802.15.7.There are two MPDU41,42 of identical destination address 1 and frame type 1 before entering physical layer, add MPDU delimiter field MD212,222 respectively, and fill field Pad213,223, be then polymerized to a MPDU.In physical layer, the MPDU after this polymerization constitutes single PSDU121.Owing to having identical mac frame stem 410, therefore can carry out MAC stem 410 when being polymerized and merge.Like this, the fixed overhead part in PSDU121 can effectively be reduced.In physical layer, physical layer header 120 is added to PSDU121, generate PPDU131.After adding lead code 130 to PPDU again, just can be used for the transfer of data of physical layer.
Polymerization in the present invention, compared with A-MPDU frame aggregation method in IEEE802.11n standard in Fig. 2, when using frame aggregation method, being according to the destination address in MAC stem and frame type 410, not relating to MSDU411,421.Frame aggregation in Fig. 2 is destination address 210 according to MAC and access category 211,221.Wherein, access category 211,221 and service quality (Quality of Service, QoS) are correlated with.
Polymerization in the present invention, compared with using the frame aggregation method in the short distance radio communication standards of visible ray with IEEE802.15.7 in Fig. 3, polymerization process occurs in MAC layer, and gives the method for mac frame polymerization, i.e. the destination address of mac frame and frame type.
Fig. 5 shows the detailed process of the frame aggregation method in the present invention.In MAC layer, receive the packet from LLC layer, it is the payload portions MSDU of MPDU, as shown in step 501.Bottom MAC layer, before MSDU, add MAC stem, generate MPDU, as shown in Figure 1.In MAC stem, include the information such as frame type and destination address of MPDU.Mac frame polymerization in the present invention, is applied to before these MPDU import physical layer into.First, each stem that will enter the MPDU of physical layer is analyzed, as shown at step 502.Main purpose due to polymerization improves throughput, and therefore polymerization is the MPDU of Data for frame type.Compared with Data frame type, other type frame in table 1, as Beacon, CVD etc., has higher requirement to robustness, is not therefore polymerized, as shown in step 506.In Data frame type, its destination address is judged, as shown in step 503.If the destination address of multiple MPDU is identical, then these MPDU are polymerized to a MPDU, as indicated in step 504.The MPDU of not identical destination address, is polymerized to different MPDU, as shown in step 505.Finally, by these MPDU physical layer for transmission, then transmission is packaged with the PPDU of MPDU, as illustrated at step 507.
In order to realize aforesaid operations, setting as shown in Figure 7 can be carried out, aggregation decisions unit is set, and destination address acquiring unit, the type acquiring unit that can be connected with aggregation decisions unit.Wherein, type acquiring unit can obtain the type of MPDU, and informs aggregation decisions unit; Destination address acquiring unit can obtain the destination address of MPDU, and informs aggregation decisions unit; Aggregation decisions unit according to the type of the MPDU received and destination address, can determine whether this MPDU carries out being polymerized and polymerization methods.Certainly, aggregation decisions unit can also be connected with polymerization performance element, and the polymerization methods determined can be informed to polymerization performance element by aggregation decisions unit, and polymerization performance element then can perform according to the polymerization methods received and be polymerized process accordingly.
It should be noted that, the operation that above-mentioned each unit can perform specifically describes in conjunction with each accompanying drawing in foregoing teachings, does not repeat them here.
Visible in sum, no matter be method or device, mac frame polymerization technique of the present invention, can under the condition not changing existing MPDU type and form, by to the type of MPDU stem and the analysis of destination address, realize the transfer of data meeting robustness and high-throughput requirement.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. media interviews control a mac frame polymerization, and it is characterized in that, the method comprises:
According to type and the destination address of Medium Access Control (MAC) Protocol Data Unit MPDU, determine whether this MPDU carries out being polymerized and polymerization methods.
2. method according to claim 1, is characterized in that, when determining whether MPDU is polymerized, determines that the MPDU being only data Data for frame type is polymerized.
3. method according to claim 1, is characterized in that, when determining polymerization methods, determines the MPDU with identical destination address to be aggregated in same MPDU, is aggregated in different MPDU by the MPDU with different destination address.
4. the method according to any one of claims 1 to 3, is characterized in that, described method performed before MPDU enters physical layer.
5. method according to claim 1, is characterized in that, described method is applied to visible light communication.
6. a mac frame polyplant, is characterized in that, this device comprises destination address acquiring unit, type acquiring unit and aggregation decisions unit; Wherein,
Described type acquiring unit, for obtaining the type of MPDU;
Described destination address acquiring unit, for obtaining the destination address of MPDU;
Described aggregation decisions unit, for according to the type of described MPDU and destination address, determines whether this MPDU carries out being polymerized and polymerization methods.
7. device according to claim 6, is characterized in that, described aggregation decisions unit when determining whether MPDU is polymerized, for: determine that the MPDU being only Data for frame type is polymerized.
8. device according to claim 6, it is characterized in that, described aggregation decisions unit when determining polymerization methods, for: determine the MPDU with identical destination address to be aggregated in same MPDU, the MPDU with different destination address be aggregated in different MPDU.
9. the device according to any one of claim 6 to 8, is characterized in that, described aggregation decisions unit is used for before MPDU enters physical layer, determine whether MPDU carries out being polymerized and polymerization methods.
10. device according to claim 6, is characterized in that, described device is used for visible light communication.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310219192.0A CN104219031A (en) | 2013-06-04 | 2013-06-04 | MAC (media access control) frame aggregation method and device |
| PCT/CN2013/086553 WO2014194604A1 (en) | 2013-06-04 | 2013-11-05 | Mac frame aggregation method and apparatus |
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| CN201310219192.0A CN104219031A (en) | 2013-06-04 | 2013-06-04 | MAC (media access control) frame aggregation method and device |
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| WO2014194604A1 (en) | 2014-12-11 |
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