# US 10,313,143 B1 · Wireless communication system to provide buffering in a single frequency network

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- Number: US 10,313,143 B1
- Document ID: US10313143B1
- Status: Granted
- Kind: B1
- Application number: 14/628,361
- Filed: 2015-02-23
- Granted: 2019-06-04
- Earliest claimed: 2015-02-23
- Assignees: Sprint Communications Company L.P.
- Applicants: Sprint Communications Company L.P.
- Inventors: Volkan Sevindik
- Web page: https://patentgrep.com/patent/US10313143B1

## CPC

- H04L 12/1881: {with schedule organisation, e.g. priority, sequence management}
- H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)}
- H04W 56/001: {Synchronization between nodes}
- H04W 72/30: Resource management for broadcast services
- H04W 88/08: Access point devices
- 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 wireless communication system synchronizes a Single Frequency Network (SFN). The wireless communication system includes a multicast server system that transmits multimedia content to wireless access points. The wireless access points determine and transmit SFN transmit time information to the multicast server system. The multicast server system uses the SFN transmit time information to determine individual buffering information for each of the wireless access points. The multicast server system adjusts a buffer delay for each individual wireless access points using the individual buffering information. The multicast server system transmits the multimedia content to wireless access points.

## Claims

### Claim 1

A method of operating a wireless communication system to synchronize a Single Frequency Network (SFN), the method comprising:
a multicast wireless access point transmitting multimedia content for delivery to other wireless access points;
the multicast wireless access point and the other wireless access points wirelessly transmitting the multimedia content to user equipment;
the other wireless access points determining and transmitting SFN transmit time information for delivery to the multicast wireless access point;
the multicast wireless access point determining an average SFN transmit time based on the SFN transmit time information and transferring the average SFN transmit time for delivery to the other wireless access points; and
one of the other wireless access points stopping the wireless transmission of the multimedia content to the user equipment when the one of the other wireless access points is not transmitting within the average SFN transmit time.

### Claim 2 (depends on 1)

The method of claim 1 wherein the SFN comprises a Multimedia Broadcast Multicast Service (MBMS).

### Claim 3 (depends on 1)

The method of claim 1 further comprising:
the multicast wireless access point transferring a SFN transmit time information request for delivery to the other wireless access points;
in response to the SFN transmit time information request, the other wireless access points transferring updated SFN transmit time information for delivery to the multicast wireless access point.

### Claim 4 (depends on 1)

The method of claim 1 wherein the other wireless access points comprise Wireless Fidelity (WIFI) wireless access points.

### Claim 5 (depends on 1)

The method of claim 1 wherein the other wireless access points comprise femtocell base stations.

### Claim 6 (depends on 1)

The method of claim 1 wherein other wireless access points comprise Long-Term Evolution (LTE) eNodeBs.

### Claim 7 (depends on 1)

The method of claim 1 wherein the wireless communication network comprises a Long-Term Evolution (LTE) network.

### Claim 8

A wireless communication system to synchronize a Single Frequency Network (SFN), the wireless communication system comprising:
a multicast wireless access point configured to transmit multimedia content for delivery to other wireless access points;
the multicast wireless access point and the other wireless access points configured to wirelessly transmit the multimedia content to user equipment;
the other wireless access points configured to determine and transmit SFN transmit time information for delivery to the multicast wireless access point;
the multicast wireless access point determining an average SFN transmit time based on the SFN transmit time information and transferring the average SFN transmit time for delivery to the other wireless access points; and
one of the other wireless access points configured to stop the wireless transmission of the multimedia content to the user equipment when the one of the other wireless access points is not transmitting within the average SFN transmit time.

### Claim 9 (depends on 8)

The wireless communication system of claim 8 wherein the SFN comprises a Multimedia Broadcast Multicast Service (MBMS).

### Claim 10 (depends on 8)

The wireless communication system of claim 8 wherein the other wireless access points comprise Wireless Fidelity (WIFI) wireless access points.

### Claim 11 (depends on 8)

The wireless communication system of claim 8 wherein the other wireless access points comprise Long-Term Evolution (LTE) eNodeBs.

### Claim 12 (depends on 8)

The wireless communication system of claim 8 wherein the wireless communication network comprises a Long-Term Evolution (LTE) network.