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Communication method for wireless LANS

a communication method and wireless lan technology, applied in the field of communication apparatus, can solve the problems of affecting the increase of throughput, unable to improve the effective throughput of communication, and the format of a phy frame ceases to be effective any more, so as to improve the substantial throughput of communication, eliminate overhead, and improve frame format efficiency

Inactive Publication Date: 2006-05-04
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention has been made to solve the above problems, and has as its object to provide a method for a communication apparatus which can coexist with an existing apparatus and can improve the substantial communication throughput by eliminating overhead accompanying the transmission of a plurality of frames by making a frame format more efficient.

Problems solved by technology

Even if an attempt to increase the communication speed in terms of physical layer succeeds, the effective throughput of communication cannot be improved.
That is, when an increase in the communication speed of the physical layer is realized, the format of a PHY frame ceases to be effective any more.
An increase in overhead due to this may hinder an increase in throughput.
However, a physical layer header cannot be effectively reduced.
However, since the length of a physical layer frame containing MAC frames cannot be increased beyond about 4 kbytes under the conventional limitation on the physical layer, an improvement in efficiency is greatly limited.
Even if the length of a PHY layer frame can be increased, another problem arises, i.e., a reduction in error tolerance.

Method used

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  • Communication method for wireless LANS
  • Communication method for wireless LANS
  • Communication method for wireless LANS

Examples

Experimental program
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first embodiment

[0069] In the first embodiment of the present invention, the MAC efficiency is improved by aggregating a plurality of MPDUs and then piggybacking the MPDUs in the opposite direction on a partial response from a destination. Application methods for the immediate Block Ack and delayed Block Ack techniques defined in IEEE 802.11e / Draft 10.0 will also be described below.

[0070] More specifically, a communication apparatus according to the first embodiment piggybacks at least one data frame on a Block Ack frame in immediate Block Ack transmission. For this purpose, the initiator side of data transmission transmits a transmission permission frame, which permits a destination terminal to piggyback a plurality of data frames, upon aggregating the control frame (Block Ack Request frame, or Block Ack frame) with a data frame. Such communication apparatus of the first embodiment searches a physical frame returned from a destination, when operating as a transmitting terminal. If Block Ack frame...

second embodiment

[0102] The second embodiment of the present invention is directed to delayed Block Ack transmission, in which a Normal acknowledgement frame for allowing the transmission of a Block Ack to be postponed is replaced with the IAC frame described in the first embodiment. More specifically, a communication apparatus according to the second embodiment of the present invention transmits a plurality of data frames and then uses an IAC frame from a destination terminal to another destination in place of a Normal acknowledgement to a delayed Block Ack. After a lapse of a predetermined period of time, the destination terminal transmits the Block Ack frame and a plurality of data upon aggregating them.

[0103] According to IEEE 802.11e / Draft 10.0, if it is difficult to return a Block Ack frame a SIFS after the reception of a Block Ack Request frame, a delayed Block Ack like the one shown in FIG. 5 can be used. According to the delayed Block Ack technique, first of all, an Ack response (Normal ac...

third embodiment

[0116] The third embodiment of the present invention is directed to the application of the immediate Block Ack technique and delayed Block Ack technique in a case wherein a plurality of MPDUs are aggregated and transmitted to a plurality of destinations. When only MAC frames addressed to the same destination are to be aggregated and transmitted, overheads like IFS (Interframe Space) and random backoff occur every time the destination changes. In contrast to this, aggregating MAC frames addressed to a plurality of different destinations into one physical frame makes it possible to reduce these overheads and improve the MAC efficiency.

[0117]FIG. 31 shows an example of a MAC frame containing information associated with a plurality of destinations. Aggregating a MAC frame 310 like this frame in the head of a physical frame allows a physical frame receiving terminal to immediately determine whether or not there is any MPDU addressed to itself exists. The MAC frame 310 like the one shown...

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Abstract

A physical frame is generated and transmitted to a destination terminal. In this physical frame, one of a data frame, an acknowledgement frame, and an acknowledgement request frame, and a transmission permission frame which is used in place of a normal Ack frame associated with a delayed Block Ack, and permits the destination terminal to perform piggyback transmission, are aggregated.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2004-318487, filed Nov. 1, 2004, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a communication apparatus and method which perform media access control on the basis of the carrier sense information of a physical layer and the carrier sense information of a MAC layer. [0004] 2. Description of the Related Art [0005] Media access control (MAC) is control for causing a plurality of communication apparatuses which perform communication while sharing the same media to decide how to use the media in transmitting communication data. Owing to media access control, even if two or more communication apparatuses transmit communication data by using the same media at the same time, there is less chance of the occurrence of ...

Claims

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Application Information

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IPC IPC(8): H04J3/22H04J3/16H04Q7/00H04J3/18H04L12/28H04L29/10H04W72/14H04W74/08H04W84/12
CPCH04L1/1614H04L1/1671H04L1/1685H04L1/1835H04L1/188H04W72/14H04W74/0866H04W72/23
Inventor NISHIBAYASHI, YASUYUKITAKAGI, MASAHIROADACHI, TOMOKONAKAJIMA, TETSUTANDAI, TOMOYAUTSUNOMIYA, YORIKO
Owner KK TOSHIBA
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