# US 2015/0146597 A1 · Method for communicating encoded traffic indication map information

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- Number: US 2015/0146597 A1
- Document ID: US20150146597A1
- Status: Published application
- Kind: A1
- Application number: 14/406,576
- Filed: 2013-06-11
- Published: 2015-05-28
- Earliest claimed: 2012-06-13
- Assignees: Kt Corporation
- Applicants: Kt Corporation
- Inventors: Yang Seok Jeong; Joo Young Kim
- Web page: https://patentgrep.com/patent/US20150146597A1

## CPC

- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04B 7/26: at least one of which is mobile
- H04W 24/02: Arrangements for optimising operational condition
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Provided is a method of communicating encoded traffic indication map (TIM) information that can reduce power consumption by reducing an unnecessary decoding process. A method of receiving, by a terminal, a TIM that is encoded in a hierarchical structure including a page, a block, and a sub-block includes receiving an encoded TIM from an access point (AP), extracting a page index from the encoded TIM, and extracting block bitmap information indicating whether blocks included in a page designated by the page index include a bitmap. Therefore, an unnecessary decoding process with respect to each delivery traffic indication map (DTIM) beacon can be reduced, thereby reducing power consumption of a low-power terminal.

## Claims

### Claim 1

A method of receiving, by a terminal, a traffic indication map (TIM) that is encoded in a hierarchical structure including a page, a block, and a sub-block, wherein the method comprising:
receiving an encoded TIM from an access point (AP);
extracting a page index from the encoded TIM; and
extracting block bitmap information indicating whether blocks included in a page designated by the page index include a bitmap.

### Claim 2 (depends on 1)

The method of claim 1, wherein the block bitmap information is positioned before bitmap information designating the block or the sub-block within the encoded TIM.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
decoding, when bits for designating a block including an association ID (AID) of the terminal are set in the extracted block bitmap information, a bitmap of the block including the AID of the terminal.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
stopping, when bits for designating a block including an AID of the terminal are not set in the extracted block bitmap information, decoding of a bitmap designating the block or the sub-block.

### Claim 5 (depends on 4)

The method of claim 4, wherein, when the bits for designating the block including the AID of the terminal are not set in the extracted block bitmap information, the terminal enters a power save mode without decoding the bitmap for designating the block or the sub-block.

### Claim 6

A method of transmitting, by an AP, a TIM that is encoded in a hierarchical structure including a page, a block, and a sub-block, wherein the method comprising:
generating block bitmap information for designating whether blocks included in a page designed by a page index include a bitmap;
generating a TIM including the page index and the block bitmap information; and
transmitting the TIM to a terminal.

### Claim 7 (depends on 6)

The method of claim 6, wherein the block bitmap information is positioned before bitmap information for designating the block or the sub-block within the encoded TIM.