Method for group call communication

• US 8,432,880 B2
• Filed: 07/31/2009
• Issued: 04/30/2013
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola Solutions, Inc.
• Inventors: Dewasurendra, Duminda A., Ekanayake, Mahes M., Phang, Wayne M.
• Primary Examiner(s): Wong, Xavier S.
• Assistant Examiner(s): ANDREWS, LEON T
• Application Number:
  US12/533,200
• Publication Number:
  US 20110028140A1
• Time in Patent Office: 1,369 Days
• Field of Search: None
• US Class Current: 370/338
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/40 for selective distribution or broadcast

Abstract

A method for communicating a group call within a communication network comprising at least one repeater and a plurality of communication devices includes: receiving at least one preamble slot and at least one synchronization slot from an originator communication device by the repeater and a communication device; operating the communication device to receive one or more calls directly from the originator device via eavesdropping on the repeater uplink channel when a received signal strength indication (RSSI) of the direct preamble and synchronization slots is greater than a threshold; and operating the communication device to receive one or more calls from the originator device via the repeater on a repeater downlink channel of the repeater when the direct RSSI is not greater than the threshold.

Claims

1. A method for improving repeater-enabled group call coverage within a wireless communication network comprising at least an originator wireless communication device, a repeater device, and a plurality of target wireless communication devices, the method comprising:

eavesdropping, by at least a particular one of the plurality of target wireless communication devices, on a wireless uplink channel between the at least one originator wireless communication device of a repeater-enabled group call and the repeater device and receiving at least one preamble slot, at least one synchronization slot, and at least one repeater request directly from the originator wireless communication device via the eavesdropped wireless uplink channel, wherein the particular target wireless communication device is within a wireless transmission range of the originator wireless communication device, thereby increasing a wireless coverage area of the repeater-enabled group call to a union of a coverage area of the repeater device and a coverage area of the originator wireless communication device;

determining, by the particular target wireless communication device, whether a direct received signal strength indication (RSSI) of signals received directly from the originator wireless communication device via the eavesdropped wireless uplink channel is greater than a threshold;

operating the particular target wireless communication device to receive the repeater-enabled group call directly from the originator wireless communication device via the eavesdropped wireless uplink channel, instead of on a repeater downlink channel of the repeater device where the repeater-enabled group call will also be made available by the repeater device, when the determining is that the direct RSSI of the signals received directly from the originator wireless communication device is greater than the threshold; and

operating the particular target wireless communication device to receive the repeater-enabled group call from the originator wireless communication device via the repeater device on the repeater downlink channel of the repeater device, instead of directly from the originator wireless communication device via the eavesdropped wireless uplink channel, when the determining is that the direct RSSI signals received directly from the originator wireless communication device is not greater than the threshold.

2. The method of claim 1, further comprising prior to the receiving of the at least one preamble slot and the at least one synchronization slot:

initiating the repeater-enabled group call by the originator wireless communication device sending the at least one preamble slot and the at least one synchronization slots in an uplink hopset.

3. The method of claim 1, wherein the at least one preamble slot and the at least one synchronization slot include time and frequency synchronization information.

4. The method of claim 1, further comprising:

additionally receiving, by the particular target wireless communication device, retransmissions of the at least one preamble slot and the at least one synchronization slot from the repeater device on the repeater downlink channel of the repeater device.

5. The method of claim 4, wherein the repeater device is in direct communication range of the originator wireless communication device.

6. The method of claim 4, further comprising:

operating the repeater device and the particular target wireless communication device to each synchronize themselves using the received at least one preamble slot and the at least one synchronization slot.

7. The method of claim 6, wherein the determining is that the direct RSSI of the preamble and synchronization slots is greater than the threshold, the method further comprising:

operating the repeater device to retransmit the at least one preamble slot and the at least one synchronization slot on the repeater downlink channel;

receiving, by at least one other target wireless communication device of the plurality of target wireless communication devices in a coverage area of the repeater device, the at least one preamble slot and the at least one synchronization slot retransmitted on the repeater downlink channel; and

operating the at least one other target wireless communication device to receive the repeater-enabled group call from the originator wireless communication device via the repeater device on the repeater downlink channel

wherein the determining, by the particular target wireless communication device, is that the direct RSSI of the signals received directly from the originator wireless communication device is greater than the threshold and the particular target wireless communication device is operated to receive the repeater-enabled group call directly from the originator wireless communication device instead of on the repeater downlink channel.

8. The method of claim 7, further comprising:

operating the at least one other target wireless communication device to synchronize to the repeater downlink channel of the repeater device in response to receiving the at least one preamble slot and the at least one synchronization slot retransmitted on the repeater downlink channel.

9. The method of claim 1, further comprising:

transmitting a repeater request acknowledgement from the repeater device to the originator wireless communication device in response to receiving the at least one repeater request.

10. The method of claim 1, further comprising:

transmitting the repeater-enabled group call on the wireless uplink channel by the originator wireless communication device.

11. The method of claim 10, further comprising:

operating the repeater device to retransmit the repeater-enabled group call on the repeater downlink channel.

17. The method of claim 1, wherein the determining, by the particular target wireless communication device, whether the direct RSSI of signals received directly from the originator wireless communication device is greater than a threshold is performed during one of the reception of the preamble and synchronization slots.

12. A method for improving repeater-enabled group call coverage within a wireless communication network comprising at least an originator wireless communication device, a repeater device, and a plurality of target wireless communication devices, the method comprising:

eavesdropping, by at least a particular one of the plurality of target wireless communication devices, on a wireless uplink channel between the at least one originator wireless communication device and the repeater device of a repeater-enabled group call and receiving at least one preamble slot, at least one synchronization slot, and at least one repeater request directly from the originator wireless communication device via the eavesdropped wireless uplink channel, wherein the particular target wireless communication device and the repeater device are within a wireless transmission range of the originator wireless communication device, thereby increasing a wireless coverage area of the repeater-enabled group call to a union of a coverage area of the repeater device and a coverage area of the originator wireless communication device;

receiving, by the particular target wireless communication device, retransmitted ones of the at least one preamble slot and the at least one synchronization slot by from the repeater device on a downlink channel of the repeater device;

comparing, by the particular target wireless communication device, an uplink direct received signal strength indication (RSSI) of the wireless uplink channel from the originator wireless communication device to the repeater device, to an indirect downlink RSSI of the downlink channel from the repeater device;

operating the particular target wireless communication device to receive the repeater-enabled group call directly from the originator wireless communication device via the eavesdropped wireless uplink channel, instead of on a repeater downlink channel of the repeater device where the repeater-enabled group call will also be made available by the repeater device, when the uplink RSSI is greater than the downlink RSSI; and

operating the particular communication device to receive the repeater-enabled group call from the originator wireless communication device via the repeater on the downlink channel of the repeater device, instead of directly from the originator wireless communication device via the eavesdropped wireless uplink channel, when the uplink RSSI is not greater than the downlink RSSI.

13. The method of claim 12, wherein the uplink RSSI is greater than the downlink RSSI, the method further comprising:

receiving, by at least one other target wireless communication device in a coverage area of the repeater device, the at least one preamble slot and the at least one synchronization slot retransmitted on the repeater downlink channel; and

operating the at least one other target wireless communication device to receive the repeater-enabled group call from the originator wireless communication device via the repeater device on the repeater downlink channel;

wherein the determining, by the particular target wireless communication device, is that the uplink RSSI is greater than the downlink RSSI and the particular target wireless communication device is operated to receive the repeater-enabled group call directly from the originator wireless communication device instead of on the repeater downlink channel.

14. The method of claim 13, further comprising:

transmitting the repeater-enabled group call on the wireless uplink channel by the originator wireless communication device.

15. The method of claim 14, further comprising:

operating the repeater device to retransmit the repeater-enabled group call on the repeater downlink channel.

16. The method of claim 13, wherein the at least one preamble slot and the at least one synchronization slot include time and frequency synchronization information.