Method for setting sleep interval in a broadband wireless access communications system

A broadband wireless and communication system technology, applied in the field of controlling sleep mode and wake-up mode, can solve the problems of packet data transmission performance degradation, packet data loss, etc.

Inactive Publication Date: 2006-05-31
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0077] (2) If an error occurs when the subscriber station transitions state from sleep mode to wake-up mode, at the base station side, fatal loss of packet data may occur due to buffering problems
At this time, in order to determine whether the packet d...

Method used

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  • Method for setting sleep interval in a broadband wireless access communications system
  • Method for setting sleep interval in a broadband wireless access communications system
  • Method for setting sleep interval in a broadband wireless access communications system

Examples

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no. 1 example

[0116] As the first embodiment of the present invention, the following will refer to Figure 7 and Figure 8 To illustrate the method of keeping the sleep interval value at the maximum window (MAX-WINDOW) value.

[0117] Typically, after the sleep interval has expired and transitioned to the awake mode in sleep mode, the subscriber station transitions back to sleep mode if it receives a negative signal in the traffic indication message during the listen interval.

[0118] After the subscriber station is woken up from the sleep mode, if the subscriber station transitions back to the sleep mode without data transmission / reception, there is a high possibility that data is not transmitted for a while. Then, the sleep interval is gradually increased exponentially to reach the maximum window size previously specified by the base station. Therefore, the first embodiment of the present invention provides a method of continuing to maintain the sleep interval at the maximum window val...

no. 2 example

[0137] As a second embodiment of the present invention, the following will refer to Figure 9 and Figure 10 A method for repeating the process of increasing the sleep interval up to the maximum window value after setting the sleep interval to the minimum window (MIN-WINDOW) value will be described.

[0138] If no data is transmitted, the base station sends a traffic indication message containing negative information to the subscriber station, and the subscriber station receiving the message continues to stay in sleep mode. However, since the data to be transmitted by the base station is not real-time data, the data has random characteristics in terms of frequency of occurrence.

[0139] Therefore, it can be considered that when the sleep interval reaches the maximum window, the sleep interval is set back to the minimum window, and then the sleep interval is increased exponentially.

[0140] Figure 9 A process of setting the sleep interval back to the minimum window value ...

no. 3 example

[0156] As a third embodiment of the present invention, the following will refer to Figure 11 12 to illustrate a method of resetting the sleep interval to a new message when the sleep interval reaches the maximum window value.

[0157] Under normal circumstances, when doubling the sleep interval, the sleep interval reaches the maximum window if there is no data to be sent by the base station. In this case, it is preferable to increase the minimum window value and the maximum window value since the frequency at which data is received by the subscriber station can be significantly reduced. That is, a new sleep interval must be set.

[0158] Figure 11 Shown is a procedure for requesting setting of a new sleep interval by a subscriber station by sending a sleep request message when the sleep interval reaches the maximum window value. As explained in the first and second embodiments, after the sleep interval reaches the maximum window value 1117, the subscriber station 1111 tra...

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Abstract

A broadband wireless access communication system having a sleep mode in which no data is to be transmitted or received by a subscriber station to/from a base station and an awake mode in which data is to be sent to/from a subscriber station The base station transmits or receives. After the sleep interval between the start time of the sleep mode and the start time of the wake-up mode reaches a given maximum window value, the subscriber station sets the next sleep mode. The subscriber station receives a traffic indication message after the start time of the wake-up mode, and the message indicates that there is no data to be transmitted from the base station; sends a sleep request message to the base station; receives a response message of the sleep request message from the base station; and then in the next sleep mode in operation.

Description

technical field [0001] The present invention generally relates to a broadband wireless access communication system, in particular to a method for controlling a sleep mode and an awake mode in a broadband wireless access communication system using Orthogonal Frequency Division Multiplexing (OFDM) Methods. Background technique [0002] In a fourth generation (4G) communication system, a technique for providing a service guaranteeing various qualities of service (QoS) to users at a data rate of about 100 Mbps is actively being studied. [0003] In an outdoor channel environment with a relatively poor channel environment, current third-generation (3G) communication systems generally support a data rate of about 384Kbps, even in an indoor channel environment with a relatively good channel environment, it only supports a maximum of 2Mbps data rate. Meanwhile, a wireless local area network (LAN) system and a wireless metropolitan area network (MAN) system generally support a data...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04B7/005H04L12/28H04L12/56H04L29/06H04W52/02H04W84/12
CPCH04W84/12H04W52/0216Y02D30/70
Inventor 金昭贤具昌会孙泳文孙仲济
Owner SAMSUNG ELECTRONICS CO LTD
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