Repeater assisted channel hopping system and method therefor

• US 5,881,095 A
• Filed: 05/01/1997
• Issued: 03/09/1999
• Est. Priority Date: 05/01/1997
• Status: Expired due to Term

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Cadd, Jimmy W.
• Primary Examiner(s): LE, AMANDA T
• Application Number:
  US08/846,449
• Time in Patent Office: 677 Days
• Field of Search: 375/202, 375/211, 375/219, 455/509, 455/515, 455/517-519, 370/315, 370/319-322, 370/342, 370/344, 370/347, 370/441, 370/443, 370/458, 370/461, 370/479, 370/492, 370/501
• US Class Current: 375/132
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04B 2001/71563 Acquisition
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence

Abstract

A radio communication system (100) includes a repeater (111) that operates with a transceiver (132) on a channel hopping sequence. The repeater receives a request for repeater service transmitted by the transceiver (410), and responds by obtaining a communication slot on the channel hopping sequence (420). The repeater then executes a call setup procedure with the transceiver and with other participants of a communicating group (430). Preferably, the call setup procedure provides the repeater with information on the suitability of the communication slot (440). The repeater then retransmits information received on an inbound channel on a corresponding outbound channel using the communication slot, as the slot transitions across the channel hopping sequence (460, 470).

Claims

1. A method, comprising the steps of:

monitoring a signaling channel to detect a request for repeater service from a communication device;

monitoring a reservation channel to determine when there exists a communication slot on an inbound channel hopping sequence, when the request for repeater service is detected;

executing a setup procedure with the communication device, when an open communication slot exists on the inbound channel hopping sequence;

receiving communications from the communication device within the open communication slot as the communication slot transitions across channels of the inbound channel hopping sequence; and

retransmitting the communications received from the communication device on a corresponding communication slot of an outbound channel hopping sequence.

2. The method of claim 1, wherein the step of monitoring a reservation channel, comprises the steps of:

monitoring the reservation channel for a particular duration to determine presence of a reservation signal; and

determining that an open communication slot exists on the inbound channel hopping sequence when no reservation signal is detected during the particular duration.

3. The method of claim 1, wherein the step of executing a setup procedure, comprises the steps of:

transmitting call status and communication slot timing information to the communication device; and

receiving information from the communication device regarding suitability of the open communication slot from the communication device.

4. The method of claim 3, wherein the step of executing a setup procedure, comprises the step of, transmitting call setup information to a target communication device.

5. The method of claim 1, further comprising the steps of:

cyclically operating on successive channels of the inbound channel hopping sequence; and

transmitting a reservation signal on the reservation channel, when operating on the reservation channel.

6. The method of claim 5, wherein the step of transmitting a reservation signal comprises the step of transmitting a pseudo-random noise sequence code.

7. A method of employing a repeater in a channel hopping protocol to facilitate communication between first and second transceivers, the method comprising the steps of:

at the first transceiver;

(a) monitoring a reservation channel for a particular duration to detect a reservation signal;

(b) transmitting a request for repeater service to the repeater, when no reservation signal is detected within the particular duration;

(c) receiving information transmitted by the repeater identifying a communication slot;

(d) monitoring a reservation channel for a time duration corresponding the communication slot to detect a reservation signal;

(e) transmitting information to the repeater indicating suitability of the communication slot, when no reservation signal is detected during the monitoring of step (d); and

(f) communicating with the second transceiver via the repeater using the communication slot.

8. The method of claim 7, wherein step (c) comprises the step of monitoring a particular signaling channel to detect a targeted transmission from the repeater.

9. The method of claim 7, further comprising the steps of:

at the repeater;

receiving the request for repeater service from the first transceiver;

monitoring a reservation channel to determine when there exists a communication slot on a channel hopping sequence;

transmitting communication slot information to the first transceiver, when a communication slot exists on the channel hopping sequence;

receiving information from the first transceiver confirming suitability of the communication slot; and

operating to retransmit communications received from the first transceiver to the second transceiver using the communication slot.

10. In a system having first and second transceivers, and a repeater to facilitate communication therebetween, the system employing a channel hopping protocol including a channel hopping sequence having corresponding inbound and outbound channels, a method comprising the steps of:

at the first transceiver;

(a) obtaining a first communication slot on the channel hopping sequence;

(b) transmitting a request for repeater service to the repeater within the first communication slot while operating on a first signaling channel of the channel hopping sequence;

at the repeater;

(c) receiving the request for repeater service from the first transceiver;

(d) obtaining a second communication slot on the channel hopping sequence;

(e) transmitting information on the second communication slot to the first transceiver;

at the first transceiver;

(f) receiving the information on the second communication slot from the repeater;

(h) determining whether the second communication slot is suitable for communications;

(i) confirming suitability of the second communication slot to the repeater;

(j) communicating, using the second communication slot, particular information to the repeater for retransmission to the second transceiver;

at the repeater using the second communication slot;

(k) receiving the particular information for retransmission on an inbound channel; and

(l) retransmitting the particular information on an outbound channel corresponding to the inbound channel.

11. The method of claim 10, wherein:

step (d) comprises the step of monitoring a first reservation channel to detect an absence of a reservation signal for a particular duration, which absence indicates availability of the second communication slot; and

step (h) comprises the step of monitoring a second reservation channel to detect an absence of a reservation signal during a time period corresponding to the second communication slot.

12. The method of claim 11, wherein the inbound and outbound channels are identical for the first reservation channel, and for the second reservation channel.

13. A radio communication system, comprising:

a repeater site having a base transceiver operable to communicate according to a channel hopping protocol that defines an inbound channel hopping sequence and an outbound channel hopping sequence that comprise a plurality of inbound and outbound channels, respectively, including a reservation channel, and inbound and outbound signaling channels, wherein the base transceiver is responsive to a request for repeater service received on the inbound signaling channel to monitor the reservation channel for a communication slot, to transmit information on the communication slot, when detected, on the outbound signaling channel, and to retransmit, using the communication slot, communications received on an inbound channel on a corresponding outbound channel, while channel hopping according to the channel hopping protocol.

14. The radio communication system of claim 13, wherein the repeater site further comprises a plurality of base transceivers, and a arbitration protocol that selects one of the plurality of base transceivers to respond to a particular request for repeater service.

15. The radio communication system of claim 13, further comprising:

a subscriber transceiver that receives repeater service from the base transceiver, the subscriber transceiver being operable to obtain a system acquisition slot on the inbound channel hopping sequence, and to transmit a request for repeater service to the base transceiver within the system acquisition slot and to receive in response information on the communication slot, the subscriber transceiver being responsive to information on the communication slot to determine suitability of the communication slot, and to confirm suitability of the communication slot to the base transceiver.

16. A radio communication system having a repeater that supports a channel hopping protocol that defines an inbound channel hopping sequence and an outbound channel hopping sequence that comprise a plurality of inbound and outbound channels, respectively, including a reservation channel, the system comprising:

a subscriber transceiver that receives repeater service from the repeater, the subscriber transceiver being operable to obtain a system acquisition slot on the inbound channel hopping sequence by monitoring the reservation channel, to transmit a request for repeater service to the repeater within the system acquisition slot and to receive in response information on a communication slot, the subscriber transceiver being responsive to information on the communication slot to determine suitability of the communication slot, and to confirm suitability of the communication slot to the repeater.