Resolving hidden node problem in synchronized dcf based channel access in wlan

A technology of accessed and communication channels, applied in wireless communication, electrical components, etc.

Active Publication Date: 2015-03-11
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although long-distance communication networks such as GSM are widely accepted means for transmitting and receiving data, these networks may not be appropriate for all data applications due to cost, traffic and legislative concerns

Method used

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  • Resolving hidden node problem in synchronized dcf based channel access in wlan
  • Resolving hidden node problem in synchronized dcf based channel access in wlan
  • Resolving hidden node problem in synchronized dcf based channel access in wlan

Examples

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example 3

[0131] Use Case 3: Extended Range Wi-Fi

[0132] The main application of IEEE 802.11ah is sensor networks (eg in smart metering), where measurement information at each sensor node can be transmitted to an access point. In an example sensor application, the data packet size may be several hundred bytes, the sensor may have a low duty cycle, transmitting data every few minutes, and the number of sensor devices may be as large as 6000 devices communicating with an access point.

[0133] The IEEE 802.11ah WLAN standard organizes wireless terminal devices associated to a network into groups. The association response frame transmitted by the access point device indicates the group ID as well as the conventional association ID (AID) field, which associates the wireless terminal device to the access point. Group IDs may be numbered in descending order of group priority for quality of service (QoS) wireless terminal devices. In the case of non-QoS wireless terminal devices, the acces...

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PUM

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Abstract

Embodiments of the invention provide signaling mechanisms for wireless networks composed of a large number of stations. An example method embodiment comprises: receiving by a wireless terminal device, a first message from an access point, the first message comprising information indicating a plurality of restricted access windows, each allocated for a different group of terminal devices associated to a wireless network managed by the access point; receiving by the terminal device, a second message from the access point, within a restricted access window of the plurality of restricted access windows, the restricted access window allocated to a group of terminal devices of which the terminal device is a member, the second message comprising information indicating that a communications channel is available; and determining by the terminal device, based on the second message, that the communications channel is not occupied by hidden ones of the terminal devices associated to the network.

Description

technical field [0001] The technical field relates to wireless communications, and more particularly to signaling mechanisms for wireless networks composed of a large number of stations. Background technique [0002] Modern society has adopted and become dependent on wireless communication devices for various purposes, such as connecting users of the wireless communication devices with other users. Wireless communication devices may vary from battery powered handheld devices to stationary household and / or business devices utilizing the electrical network as a power source. Due to the rapid development of wireless communication devices, many fields have emerged that enable entirely new types of communication applications. [0003] Cellular networks facilitate communication over large geographic areas. These network technologies have generally been divided by generation, from the first generation (1G) of analog cellular telephones, which provided baseline voice communication...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/02H04W74/04H04W74/08
CPCH04W74/04H04W74/02H04W74/0816H04W74/006H04W74/085Y02D30/70
Inventor S·乔杜里C·高希T·金K·F·多普勒E·托马拉
Owner NOKIA TECHNOLOGLES OY
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