# US 2014/0153464 A1 · Delivering data to a wireless station

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- Number: US 2014/0153464 A1
- Document ID: US20140153464A1
- Status: Published application
- Kind: A1
- Application number: 14/086,007
- Filed: 2013-11-21
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Motorola Mobility LLC
- Applicants: Motorola Mobility LLC
- Inventors: Stephen P. Emeott; Murali Narasimha; Dwight R. Smith
- Web page: https://patentgrep.com/patent/US20140153464A1

## CPC

- H04W 72/02: Selection of wireless resources by user or terminal
- H04B 1/713: using frequency hopping
- H04B 1/7156: Arrangements for sequence synchronisation
- H04W 52/0206: {in access points, e.g. base stations}
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 52/0219: {where the power saving management affects multiple terminals}
- H04W 68/025: {Indirect paging}
- H04W 72/04: Wireless resource allocation
- H04W 74/04: Scheduled access (hybrid access H04W74/02)
- H04W 74/06: using polling
- H04L 41/5003: Managing SLA; Interaction between SLA and QoS
- H04L 61/10: of different types
- H04W 74/0816: with collision avoidance
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 88/08: Access point devices
- 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
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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

Disclosed are methods for delivering data (212) to a wireless station (102). An access point (104), or any other suitable device or system, receives a plurality of association requests (204) from a plurality of wireless stations (102) and transmits a different association identifier (208) to each of the plurality of wireless stations (102). The access point (104) buffers data (212) for a subset of the wireless stations (102). If the number of wireless stations (102) with buffered data (212) at the access point (104) is less than a threshold, then the access point (104) transmits a list of association identifiers indicating that buffered data (212) are held for each wireless station (102) identified by the list. If the number of wireless stations (102) with buffered data (212) at the access point (104) is not less than the threshold, then the access point (104) transmits data indicative of a range of association identifiers indicating that buffered data (212) are held for at least one wireless station (102) identified by the range.

## Claims

### Claim 1

A method of delivering data to wireless stations, the method comprising:
receiving a plurality of association requests from a plurality of wireless stations;
transmitting a different association identifier to each of the plurality of wireless stations;
buffering data for a subset of the plurality of wireless stations, the subset including a number of wireless stations;
if the number of wireless stations in the subset is less than a threshold, then transmitting a list of association identifiers indicating that buffered data are held for each wireless station identified by the list; and
if the number of wireless stations in the subset is not less than the threshold, then transmitting data indicative of a range of association identifiers indicating that buffered data are held for at least one wireless station identified by the range.

### Claim 2 (depends on 1)

The method of claim 1 further comprising transmitting polling information to indicate that each wireless station identified by the list should poll for the buffered data.

### Claim 3 (depends on 1)

The method of claim 1 further comprising transmitting schedule information indicating that each wireless station identified by the range should wake up at a scheduled wake-up time to begin receiving an associated portion of the buffered data.

### Claim 4 (depends on 3)

The method of claim 3 wherein the scheduled wake-up time is responsive to a delivery interval.

### Claim 5 (depends on 1)

The method of claim 1 further comprising transmitting a skip rate and an offset value indicative of a reporting frequency associated with buffered data availability and a synchronization point associated with at least one of the plurality of wireless stations.

### Claim 6 (depends on 5)

The method of claim 5 further comprising transmitting a counter to be used to find a signal associated with a wireless station by matching the offset value and the remainder of the counter modulo the skip rate.

### Claim 7 (depends on 5)

The method of claim 5 wherein reporting buffered data availability is limited to wireless stations that have a skip rate and an offset value aligned with a current cycle value.

### Claim 8 (depends on 5)

The method of claim 5 further comprising:
receiving a request from a wireless station to modify the skip rate;
modifying the skip rate;
modifying the offset value; and
transmitting the modified skip rate and the modified offset value to the wireless station.

### Claim 9 (depends on 1)

The method of claim 1 wherein if the number of wireless stations is greater than the threshold, then also transmitting an indication that at least one wireless station in the range need not wake up at the scheduled time to receive buffered data.

### Claim 10 (depends on 1)

The method of claim 1 wherein transmitting the list of association identifiers includes transmitting at least one low-power association identifier and at least one non-low-power association identifier.

### Claim 11 (depends on 1)

The method of claim 1 further comprising transmitting a delivery interval time indicative of a time between a transmission of first buffered data associated with a first wireless station and a transmission of second buffered data associated with a second wireless station.

### Claim 12 (depends on 1)

The method of claim 1 further comprising transmitting a skip rate indicative of a wake-up frequency associated with at least one of the plurality of wireless stations.

### Claim 13

An apparatus for delivering data to wireless stations, the apparatus comprising:
a receiver;
a transmitter;
a memory; and
a controller operatively coupled to the receiver, to the transmitter, and to the memory, the controller being structured to:
cause the receiver to receive a plurality of association requests from a plurality of wireless stations;
cause the transmitter to transmit a different association identifier to each of the plurality of wireless stations;
cause the memory to buffer data for a subset of the plurality of wireless stations, the subset including a number of wireless stations;
determine if the number of wireless stations in the subset is less than a threshold, and, if so, then cause the transmitter to transmit a list of association identifiers indicating that buffered data are held for each wireless station identified by the list; and
determine if the number of wireless stations in the subset is not less than the threshold, and, if so, then cause the transmitter to transmit data indicative of a range of association identifiers indicating that buffered data are held for at least one wireless station identified by the range.

### Claim 14

A method of receiving data at a wireless station, the method comprising:
transmitting an association request;
receiving an association identifier from an access point;
if the association identifier is in a list of association identifiers received from the access point, then polling the access point for data; and
if the association identifier is in a range of association identifiers received from the access point, then entering a power-save mode, waking up from the power-save mode at a scheduled time, and receiving data from the access point.

### Claim 15 (depends on 14)

The method of claim 14 further comprising receiving a delivery interval time indicative of a time between a transmission of first buffered data associated with a first wireless station and a transmission of second buffered data associated with a second wireless station.

### Claim 16 (depends on 15)

The method of claim 15 further comprising determining the scheduled time based on the delivery interval time and on the association identifier.

### Claim 17 (depends on 14)

The method of claim 14 further comprising:
receiving a skip rate indicative of a wake-up frequency from the access point;
wherein waking up from the power-save mode includes waking up from the power-save mode at a frequency that is based on the skip rate.

### Claim 18

An apparatus for receiving data, the apparatus comprising:
a receiver;
a transmitter; and
a controller operatively coupled to the receiver and to the transmitter, the controller being structured to:
cause the transmitter to transmit an association request;
cause the receiver to receive an association identifier from an access point;
if the association identifier is in a list of association identifiers received from the access point, then cause the apparatus to poll the access point for data; and
if the association identifier is in a range of association identifiers received from the access point, then cause the apparatus to enter a power-save mode, cause the apparatus to wake up from the power-save mode at a scheduled time, and cause the receiver to receive the data from the access point.

### Claim 19

A method of delivering data to wireless stations, the method comprising:
receiving a plurality of association requests from a plurality of wireless stations wherein the plurality of association requests include low-power association requests and non-low-power association requests;
transmitting a different association identifier to each of the plurality of wireless stations;
transmitting a skip rate indicative of a wake-up frequency associated with at least one of the plurality of wireless stations;
transmitting a delivery interval time indicative of a time between a transmission of first buffered data associated with a first wireless station and a transmission of second buffered data associated with a second wireless station;
buffering data for a subset of the plurality of wireless stations, the subset including a number of wireless stations;
if the number of wireless stations is less than a threshold, then transmitting a list of association identifiers indicating that each wireless station identified by the list is to poll for an associated portion of the buffered data;
if the number of wireless stations is greater than the threshold, then transmitting data indicative of a range of association identifiers indicating that each wireless station identified by the range is to wake up at a scheduled time to receive an associated portion of the buffered data; and
transmitting an indication that at least one wireless station in the range need not wake up at the scheduled time to receive buffered data.