# US 2008/0188253 A1 · Method and system for wireless design subject to interference constraints

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2008/0188253 A1
- Document ID: US20080188253A1
- Status: Published application
- Kind: A1
- Application number: 12/019,562
- Filed: 2008-01-24
- Published: 2008-08-07
- Earliest claimed: 2007-01-31
- Assignees: Ntt Docomo, Inc.
- Inventors: Chia-Chin Chong; Pedro C. Pinto; Moe Z. Win; Fujio Watanabe; Hiroshi Inamura
- Web page: https://patentgrep.com/patent/US20080188253A1

## CPC

- H04W 16/22: Traffic simulation tools or models
- 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 experience interference from other wireless communication networks. A method for designing wireless communication systems subject to interference is proposed based on a realistic interference model which accounts for the propagation effects introduced by the wireless environment (such as path loss, shadowing, and multipath fading), and for the spatial scattering of transmitters (using a Poisson field). The method accounts for tradeoffs between network parameters, such as signal-to-noise ratio (SNR), interference-to-noise ratio (INR), path loss exponent, spatial density of the interferers, and error probability. Advantages of this method include: 1) a unified framework for designing a wireless system, subject to cumulative interference and noise, incorporating a wide range of performance metrics; and 2) a general application that covers a broad class of wireless communication systems and channel fading distributions.

## Claims

### Claim 1

A method for designing a wireless network, comprising:
selecting a performance parameter based on a desired quality of service;
incorporating a set of expected propagation channel parameters; and
determining a set of system parameters based on the expected propagation channel parameters and an interference constraint.

### Claim 2 (depends on 1)

A method as in claim 1, wherein the interference constraint is computed based on cumulative interference.

### Claim 3 (depends on 2)

A method as in claim 2, wherein the interference constraint is expressed as a probability of the cumulative interference exceeding a predetermined threshold value.

### Claim 4 (depends on 2)

A method as in claim 2, wherein the cumulative interference is computed based on a stable distribution.

### Claim 5 (depends on 1)

A method as in claim 1, wherein the interference constraint is computed based on a bit error measure.

### Claim 6 (depends on 5)

A method as in claim 5, wherein the interference constraint is expressed as the probability of the bit error measure exceeding a predetermined threshold value.

### Claim 7 (depends on 1)

A method as in claim 1, wherein the interference constraint incorporates both narrowband and ultra-wide band sources of interference.

### Claim 8 (depends on 1)

A method as in claim 1, wherein the interference constraint incorporates one or more of spatial density of transmitters, measured interference or noise power, modulation method and bit error rate.

### Claim 9 (depends on 8)

A method as in claim 8, wherein the spatial density of transmitters is modeled by a Poisson field.

### Claim 10 (depends on 1)

A method as in claim 1, wherein the channel propagation parameters include one or more of path loss parameter, shadowing parameter, and fading parameter.

### Claim 11 (depends on 1)

A method as in claim 1, wherein the system parameters include one or more of spatial density of transmitters, measured interference or noise power, modulation method and bit error rate.

### Claim 12 (depends on 1)

A method as in claim 1, being applied to design an asynchronous wireless network.

### Claim 13 (depends on 1)

A method as in claim 1, being applied to design a synchronous wireless network.