# US 11,115,975 B2 · Method for wireless communication between subscribers and base stations

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- Number: US 11,115,975 B2
- Document ID: US11115975B2
- Status: Granted
- Kind: B2
- Application number: 16/976,116
- Filed: 2019-02-21
- Published: 2020-12-31
- Granted: 2021-09-07
- Earliest claimed: 2018-03-01
- Assignees: Obshchestvo s ogranichennoy otvetstvennostyu "RadioTekh"
- Applicants: Obshchestvo s ogranichennoy otvetstvennostyu “RadioTekh”
- Inventors: Sergey Alexandrovich Kosarev
- Web page: https://patentgrep.com/patent/US11115975B2

## CPC

- H04B 1/707: using direct sequence modulation
- H04W 72/044: based on the type of the allocated resource
- H04B 1/40: Circuits
- H04B 1/69: Spread spectrum techniques
- H04B 1/7097: Interference-related aspects
- H04B 1/715: Interference-related aspects
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04W 4/12: Messaging; Mailboxes; Announcements
- H04W 72/30: Resource management for broadcast services
- H04B 1/713: using frequency hopping
- H04B 2001/6912: {using chirp}
- H04B 2201/698: relating to Uplink
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

In a wireless communication method, base stations having an identical number of channels for receiving narrowband modulation (UNB) are divided into groups. Data transmission channels of all base stations have identical time and frequency characteristics. All subscribers split into groups are periodically sent messages with subscriber group numbers by all the base stations. When a group number of a corresponding subscriber coincides with a group number in a message received by the subscriber, all the subscribers of the group send response messages to the base stations using UNB, wherein response messages are sent sequentially from all subgroups of subscribers of the group, and subscribers of a subgroup send response messages on different frequencies. The base stations receive the response messages on all frequencies corresponding to subscribers, decode the messages and generate a database of response messages, which can be used for generating subsequent messages with corresponding subscriber group numbers.

## Claims

### Claim 1

A wireless communication method between subscribers and base stations, the method comprising:
dividing the subscribers into subscriber groups having subscriber group numbers, each of which has subgroups, each including one subscriber;
dividing the base stations into base station groups, and all base stations of all base station groups have the same number of receiving channels of a UNB narrowband modulation, and all base stations of each base station group have data channels with the same time and frequency characteristics;
periodically sending messages to all subscribers using all base stations, which includes the corresponding subscriber group numbers of subscriber groups;
receiving and decoding the messages by the subscribers;
when the subscriber group number of a respective subscriber matches the subscriber group number in a message of the messages the subscriber received, sending by all subscribers of a subscriber group of the subscriber groups having the subscriber group number response messages to base stations using a UNB narrow-band modulation, and sending the response messages sequentially from all subgroups of subscribers of the subscriber group, the subscribers of the subgroup sending the response messages at different frequencies and the base stations receiving the response messages on all frequencies corresponding to the subscribers, decoding the response messages, and forming a response message database, which is used to generate subsequent messages, including the corresponding subscriber group numbers of subscriber groups, and cyclically repeating the periodic sending of the subsequent messages and repeating the reception of the response messages.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the periodic sending of messages to all subscribers is performed using a CSS wide-band modulation.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the periodic sending of messages to all subscribers is performed using a DSSS wide-band modulation.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the periodic sending of the messages to all subscribers is performed using the UNB narrow-band modulation.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the periodic sending of the messages to the base stations of each group is performed simultaneously on different frequencies, and all subscribers receive the messages simultaneously on different frequencies.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the periodic sending simultaneously of the messages to all subscribers is performed simultaneously from all of the base stations on an identical frequency within each subscriber group and on different frequencies between different subscriber groups.

### Claim 7 (depends on 6)

The method according to claim 6, wherein when receiving the messages, each subscriber scans a frequency of the messages sent from the base stations and selects one of the identical and different frequencies with best reception conditions for receiving the messages.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the periodic sending sequentially of the messages to all of the subscribers is performed sequentially from all of the groups of the base stations on the an identical frequency.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the subscribers send the response messages in each cycle when the messages are sent by all of the base stations.

### Claim 10 (depends on 1)

The method according to claim 1, wherein each of the subscribers determines a shift in a frequency relative to that of the base station and corrects the frequency by an amount of the shift when receiving the messages.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the subsequent messages of the base stations include information on acknowledgment or non-acknowledgment of receipt by the base stations of the response messages during a previous sending of the messages, while all of the subscribers of each subscriber group forward a subsequent next response messages when the subscribers receive the subsequent messages from the base stations, including information on acknowledgment of receipt provided that the group number in the subsequent messages coincides, and if the subscribers receive the subsequent messages from the base stations, including information on non-acknowledgment of receipt, the subscribers re-send previous response messages sent during the previous sending of the messages.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the messages sent to all subscribers also include the subscriber group number of subscriber groups, and each subscriber synchronizes the transmission time of the response message with a receipt time of indicated messages from base stations, taking into account the subscriber group number of subscriber groups.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the messages sent to all subscribers also include the subscriber group number of subscriber groups, and each subscriber of each subscriber group calculates the transmission time of subsequent messages for its subscriber group after receiving the subsequent messages and is included in a reception mode only while the base stations transmit the subsequent messages for the subscriber group of subscribers of a respective base station of the base stations in a next cycle, taking into account the subscriber group number of subscriber groups of subscribers.

### Claim 14 (depends on 1)

The method according to claim 1, wherein each base station has at least one additional reception channel, and at least one subscriber sends an additional message out of turn within the subscriber group of the at least one subscriber on the frequency of the at least one additional reception channel, wherein the additional message includes a preamble and an ID number.

### Claim 15 (depends on 1)

The method according to claim 1, wherein at least one subscriber sends an additional message to any of the frequencies of the channels for receiving a UNB narrow-band modulation after all subscribers of the subscriber group of the at least one subscriber finish sending a response message, and wherein the additional message includes a preamble and an ID number.

### Claim 16 (depends on 1)

The method according to claim 1, wherein the subscribers send a response message with a frequency hopping after transmission of each symbol or each group of symbols included in the response message transmitting it each symbol or each group of symbols by means of a set of frequencies corresponding to the subscribers.

### Claim 17 (depends on 16)

The method according to claim 16, wherein the base stations for each subgroup of subscribers use associated pseudo-random frequency hopping algorithms for subscribers of each subgroup.

### Claim 18 (depends on 1)

The method according to claim 1, wherein the base stations use a server to send the messages periodically and generate a database of the response messages.

### Claim 19 (depends on 18)

The method according to claim 18, wherein the database of the response messages is transmitted via at least one communication channel to at least one information user.