# US 9,520,930 B2 · Measurement support for a smart antenna in a wireless communication system

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- Number: US 9,520,930 B2
- Document ID: US9520930B2
- Status: Granted
- Kind: B2
- Application number: 14/624,865
- Filed: 2015-02-18
- Published: 2015-06-11
- Granted: 2016-12-13
- Earliest claimed: 2004-09-10
- Assignees: InterDigital Technology Corporation
- Applicants: InterDigital Technology Corporation
- Inventors: Ana Lucia A. Pinheiro; Arty Chandra; Inhyok Cha; Paul Marinier; Vincent Roy
- Web page: https://patentgrep.com/patent/US9520930B2

## CPC

- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04B 7/0408: using two or more beams, i.e. beam diversity
- H04B 7/0695: {using beam selection}
- H04B 7/088: {using beam selection}
- H04B 17/10: of transmitters
- H04B 17/24: with feedback of measurements to the transmitter
- H04B 17/318: Received signal strength
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)}
- H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method for taking measurements with a smart antenna in a wireless communication system having a plurality of STAs begins by sending a measurement request from a first STA to a second STA. At least two measurement packets are transmitted consecutively from the second STA to the first STA. Each measurement packet is received at the first STA using a different antenna beam. The first STA performs measurements on each measurement packet and selects an antenna beam direction based on the measurement results.

## Claims

### Claim 1

A method for beam selection, the method comprising:
receiving a first measurement packet using a first receive beam, wherein the first measurement packet comprises a first antenna identity and a first sequence number;
performing a measurement associated with the first measurement packet;
changing the first receive beam to a second receive beam after receiving the first measurement packet and before receiving a second measurement packet;
receiving the second measurement packet using the second receive beam, wherein the second measurement packet comprises the first antenna identity and a second sequence number;
performing a measurement associated with the second measurement packet;
selecting a transmit beam based on the measurements.

### Claim 2 (depends on 1)

The method of claim 1, further comprising sending an indication of a number of measurement packets to be transmitted.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first measurement packet and the second measurement packet are received consecutively and are separated by an inter-frame spacing.

### Claim 4 (depends on 1)

The method of claim 1, wherein the transmit beam is selected after a determination that a last measurement packet has been received.

### Claim 5 (depends on 4)

The method of claim 4, wherein the determination that the last measurement packet has been received is made based on a sequence number associated with the last measurement packet.

### Claim 6

A station comprising:
a processor configured to:
receive a first measurement packet using a first receive beam, wherein the first measurement packet comprises a first antenna identity and a first sequence number;
perform a measurement associated with the first measurement packet;
change the first receive beam to a second receive beam after receiving the first measurement packet and before receiving a second measurement packet;
receive the second measurement packet using the second receive beam, wherein the second measurement packet comprises the first antenna identity and a second sequence number;
perform a measurement associated with the second measurement packet;
select a transmit beam based on the measurements.

### Claim 7 (depends on 6)

The station of claim 6, wherein the processor is further configured to send an indication of a number of measurement packets to be transmitted to the station.

### Claim 8 (depends on 6)

The station of claim 6, wherein the first measurement packet and the second measurement packet are received consecutively and are separated by an inter-frame spacing.

### Claim 9 (depends on 6)

The station of claim 6, wherein the transmit beam is selected after a determination that a last measurement packet has been received.

### Claim 10 (depends on 9)

The station of claim 9, wherein the determination that the last measurement packet has been received is made based on a sequence number associated with the last measurement packet.