Wireless communication system

Patent metadata

Field	Value
Publication number	US-9893760-B2
Application number	US-201414529455-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	May 2, 2007
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A method for communication includes transmitting a first uplink message from a first remote node ( 200, 300, 400 ) to a central node ( 100 ) in a wireless communication system according to a first frequency hopping scheme, and transmitting a second uplink message from a second remote node to the central node in the wireless communication system according to a second frequency hopping scheme, different from the first scheme. Both the first and the second uplink messages are received and processed at the central node.

First claim

The invention claimed is:

1. A method for communication between a central node and a multiplicity of remote nodes in a time-division-duplexing (TDD) wireless communication system, comprising:
assigning a downlink window to at least a first remote node of the multiplicity of remote nodes, during which downlink window:
the at least first remote node of the multiplicity of remote nodes is operable for receiving downlink transmissions transmitted thereto by the central node, using a first frequency hopping function; and
at least a second remote node of the multiplicity of remote nodes, other than the at least first remote node, is operable:
for ascertaining, during the downlink window, whether there exists at least one outstanding uplink message for transmission from the at least second remote node to the central node; and
responsive to said ascertaining, during the downlink window, that there exists at least one outstanding uplink message for transmission from the at least second remote node to the central node, for transmitting, during the downlink window, the at least one outstanding uplink message to the central node, using a second frequency hopping function, which is synchronized with but different from the first frequency hopping function;

ascertaining, during the downlink window, whether there exists at least one outstanding downlink message for transmission from the central node to the at least first remote node;
responsive to said ascertaining, during the downlink window, that there exists at least one outstanding downlink message for transmission to the at least first remote node, transmitting, during the downlink window, the at least one downlink message from the central node to the at least first remote node using the first frequency hopping function, which is synchronized with but different from the second frequency hopping function, thereby preventing interference between the transmission of the at least one outstanding uplink message from the at least second remote node to the central node using the second frequency hopping function and the transmission of the at least one downlink message from the central node to the at least first remote node using the first frequency hopping function; and alternatively
responsive to said ascertaining, during the downlink window, that there does not exist at least one outstanding downlink message for transmission to the at least first remote node, receiving, by the central node, during the downlink window, the at least one outstanding uplink message transmitted thereto by the at least second remote node using the second frequency hopping function.

2. The method according to claim 1 , wherein the first and second frequency hopping functions are mutually orthogonal.

3. The method according to claim 1 , wherein the first and second frequency hopping functions are mutually pseudo-orthogonal.

4. The method according to claim 1 and further comprising receiving the at least one downlink message at at least one receiver of the at least one remote node, wherein the at least one remote node actuates the at least one receiver only during the at least one downlink window.

5. The method according to claim 1 , and wherein the transmitting the at least one downlink message comprises transmitting at least one of the at least one downlink message from the central node to one or more repeaters in the wireless communication system in a manner identical to transmitting the at least one downlink message from the central node to the at least one remote node.

6. The method according to claim 1 , and wherein the transmitting the at least one downlink message comprises transmitting at least one of the at least one downlink message from the central node to one or more repeaters in the wireless communication system in a manner identical to the transmitting of the uplink messages from the at least one remote node to the central node.

7. The method according to claim 6 , and also comprising receiving the at least one of the at least one downlink message from the central node at the repeater in a manner identical to the receiving the at least one downlink message from the central node at the at least one remote node.

8. The method according to claim 6 , and also comprising receiving the at least one of the at least one downlink message from the central node at the repeater in a manner identical to the receiving the uplink messages from the at least one remote node at the repeater.

9. A time-division-duplexing (TDD) wireless communication system, comprising:
a multiplicity of remote nodes; and
a central node operative:
to assign a downlink window to at least a first remote node of the multiplicity of remote nodes, during which downlink window:
the at least first remote node of the multiplicity of remote nodes is operable for receiving downlink transmissions transmitted thereto by the central node, using a first frequency hopping function; and
at least a second remote node of the multiplicity of remote nodes, other than the at least first remote node, is operable:
for ascertaining, during the downlink window, whether there exists at least one outstanding uplink message for transmission from the at least second remote node to the central node; and
responsive to said ascertaining, during the downlink window, that there exists at least one outstanding uplink message for transmission from the at least second remote node to the central node, for transmitting, during the downlink window, the at least one outstanding uplink message to the central node, using a second frequency hopping function, which is synchronized with but different from the first frequency hopping function;

to ascertain, during the downlink window, whether there exists at least one outstanding downlink message for transmission from the central node to the at least first remote node;
responsive to said ascertaining, during the downlink window, that there exists at least one outstanding downlink message for transmission to the at least first remote node, to transmit, during the downlink window, the at least one downlink message from the central node to the at least first remote node using the first frequency hopping function, which is synchronized with but different from the second frequency hopping function, thereby preventing interference between the transmission of the at least one outstanding uplink message from the at least second remote node to the central node using the second frequency hopping function and the transmission of the at least one downlink message from the central node to the at least first remote node using the first frequency hopping function; and alternatively
responsive to ascertaining, during the downlink window, that there does not exist at least one outstanding downlink message for transmission to the at least first remote node, to receive, by the central node, during the downlink window, the at least one outstanding uplink messages transmitted thereto by the at least second remote node using the second frequency hopping function.

10. The time-division-duplexing (TDD) wireless communication system according to claim 9 , wherein the first and second frequency hopping functions are mutually orthogonal.

11. The time-division-duplexing (TDD) wireless communication system according to claim 9 , wherein the first and second frequency hopping functions are mutually pseudo-orthogonal.

12. The time-division-duplexing (TDD) wireless communication system according to claim 9 , and wherein each of the remote nodes comprises at least one receiver for receiving the at least one downlink message, wherein the at least one remote node actuates the at least one receiver only durin

Assignees

• Tyco Fire & Security Gmbh

Inventors

• Mushkin Mordechai
• Zigdon Shimon
• Ratner Miri
• Harif David

Classifications

• H04B7/0808

  comparing all antennas before reception · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04B1/7136 Primary

  Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform · CPC title

• H04B1/71635

  Transmitter aspects (H04B1/7174 takes precedence) · CPC title

• H04B1/7183

  Synchronisation · CPC title