Transceiver sharing between access and backhaul in a wireless digital communication system

• US 5,479,400 A
• Filed: 06/06/1994
• Issued: 12/26/1995
• Est. Priority Date: 06/06/1994
• Status: Expired due to Term

• Current Assignee: Google Inc. (Alphabet Inc.)
• Original Assignee: Metricom, Inc.
• Inventors: Dilworth, Robert P., Flammer, III, George H., Galloway, Brett D.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): BLUM, RUSSELL
• Application Number:
  US08/254,205
• Time in Patent Office: 568 Days
• Field of Search: 370/94.1, 370/24, 370/30, 370/60, 370/71, 370/73, 370/75, 370/95.1, 370/95.3, 379/58-60, 379/63, 455/33.1, 455/33.2, 455/49.1, 455/54.1, 455/56.1
• US Class Current: 370/331
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A microcellular digital packet communication system is provided for digital communication having a plurality of repeating packet-mode fixed-site transceivers each being at a plurality of different sites and each being capable of communicating on mutually-common frequencies, including for example by means of frequency-hopping spread spectrum, wherein a terminal transceiver directly communicates substantially simultaneously with at least a few of the fixed-site transceivers on the mutually-common frequencies and distributes information packets of a single originating message among the fixed-site transceivers, the fixed-site transceivers forwarding the information packets via multiple communication links to a single destination terminal on the mutually-common frequencies at which the message is reassembled. The system enables reliable handoffs and robust connectivity by maintaining multiple simultaneous communication links between terminal transceivers and repeating transceivers.

Claims

1. A digital packet communication system for digital data communication, said communication system comprising:

a plurality of repeating packet-mode fixed-site wireless transceiver means;

at least one wireless non-fixed-site terminal transceiver means capable of originating targeted information packets, said non-fixed-site terminal transceiver means including a modulator means for directly communicating substantially simultaneously with at least a few of said plurality of fixed-site transceiver means over a plurality of different communication links on mutually-common frequencies; and

destination terminal transceiver means capable of receiving the targeted information packets;

said wireless non-fixed-site terminal transceiver means comprising

     1) means for managing exchange of said targeted information packets and control packets with said plurality of fixed-site transceiver means and in particular with said few fixed-site transceiver means, and

     2) means for distributing said information packets of a single originating message among said few of said fixed-site transceiver means, said few fixed-site transceiver means being operative to forward said targeted information packets of said single originating message to said destination terminal means, said destination terminal means being operative to reassemble said targeted information packets into a single message while eliminating redundant packets; and

said fixed-site transceiver means each comprising transmitter means and receiver means shared between communications with other fixed-site transceiver means over said mutually common frequencies and communication with said wireless non-fixed site terminal transceiver means over said mutually common frequencies.

2. The system of claim 1 wherein said fixed-site transceiver means each include means for conveying targeted information packets of a single target message to said destination terminal means, such that said destination terminal means receives said targeted information packets from said few of said fixed-site transceiver means via said mutually-common frequencies.

3. The system of claim 1 wherein at least one of said fixed-site transceiver means is capable of communicating selected ones of said targeted information packets with selected other fixed-site transceiver means only via another intervening fixed-site transceiver means.

4. The system of claim 1 wherein said wireless non-fixed-site terminal transceiver means is operative to exchange said control packets separate from said information packets on a frequency in common with related information packets among at least a few of said fixed-site transceiver means to maintain information on availability and quality of said communication links.

5. The system of claim 1 wherein said wireless non-fixed-site terminal transceiver means is operative to exchange said control packets separate from said information packets on a frequency in common with related information packets between said wireless non-fixed-site terminal transceiver means and at least a few of said fixed-site transceiver means to maintain information on availability and quality of said communication links.

6. The system of claim 2 wherein said targeted information packets of a single message are received at said destination terminal transceiver means via a plurality of said mutually-common frequencies.

7. In a digital packet communication system for digital communication having a plurality of repeating packet-mode fixed-site wireless transceiver means, said fixed-site transceiver means each being at a plurality of different sites and each having modulator means for communicating on mutually-common frequencies, a method for communication of targeted information packets and control packets comprising:

using a non-fixed-site wireless terminal transceiver means for establishing wireless two-way communications with at least a few of said plurality of said fixed-site transceiver means over a plurality of communication links on said mutually-common frequencies of said fixed-site transceiver means;

using said non-fixed-site wireless terminal transceiver means for managing exchange of said targeted information packets and control packets with said plurality of fixed-site transceiver means and in particular with said few fixed-site transceiver means;

using said non-fixed-site wireless terminal transceiver means for distributing said targeted information packets of a single originating message among said few of said fixed-site transceiver means, such that said targeted information packets are interleaved among a plurality of said transceiver means;

using said fixed-site transceiver means for forwarding said targeted information packets of said single originating message to a single destination terminal means, said single destination terminal means operative to reassemble said information packets into a single message while eliminating redundant packets; and

using a transmitter means and receiver means within at least one of said non-fixed-site transceiver means for exchanging packets with said non-fixed-site wireless terminal transceiver means and for exchanging packets with another of said fixed-site transceiver means on a time-shared basis over said mutually common frequencies, whereby said transmitter means and receiver means are shared between communications with said another fixed-site transceiver means and communications with said non-fixed-site transceiver means.

8. The method of claim 7 further comprising the step of using said fixed-site transceiver means for conveying the targeted information packets of a single target message to said one destination terminal transceiver means, such that said destination terminal transceiver means receives said targeted information packets from said few of said fixed-site transceivers via said mutually-common frequencies.

9. The method of claim 7 further comprising the step of communicating selected ones of said targeted information packets with selected other fixed-site transceiver means only via another intervening fixed-site transceiver means.

10. The method of claim 7 further comprising the step of exchanging said control packets separate from said targeted information packets on a frequency in common with related targeted information packets among at least a few of said fixed-site transceiver means to maintain information on availability and quality of said communication links.

11. The method of claim 7 further comprising the step of using said non-fixed-site terminal transceiver means to exchange said control packets separate from said targeted information packets on a frequency in common with related targeted information packets between said non-fixed-site terminal transceiver means and at least a few of said fixed-site transceiver means to maintain information on availability and quality of said communication links.

12. The system of claim 7 further comprising the step of receiving said targeted information packets of a single message at said destination terminal means via a plurality of said mutually-common frequencies.

13. A microcellular digital packet communication system for digital data communication, said communication system comprising:

a plurality of repeating packet-mode fixed-site wireless transceiver means, said fixed-site transceiver means each being at a plurality of different sites and each having modulator means for communicating on mutually-common frequencies;

at least one wireless non-fixed-site terminal transceiver means capable of originating targeted information packets, said non-fixed-site terminal transceiver means including a modulator means for directly communicating substantially simultaneously with at least a few of said plurality of fixed-site transceiver means over a plurality of different communication links on said mutually-common frequencies; and

destination terminal transceiver means capable of receiving the targeted information packets;

said wireless non-fixed-site terminal transceiver means comprising means for managing exchange of said targeted information packets and control packets with said plurality of fixed-site transceiver means and in particular with said few fixed-site transceiver means for distributing said information packets of a single originating message among said few of said fixed-site transceiver means, said few of said fixed-site transceiver means being operative to forward said targeted information packets of said single originating message to said destination terminal means, said destination terminal means being operative to reassemble said targeted information packets into a single message while eliminating redundant packets, wherein said targeted information packets of a single message are received via a plurality of said mutually-common frequencies.

14. In a microcellular digital packet communication system for digital communication having a plurality of repeating packet-mode fixed-site wireless transceiver means, said fixed-site transceiver means each being at a plurality of different sites and each having modulator means for communicating on mutually-common frequencies, a method for communication of targeted information packets and control packets comprising:

using a control means at a non-fixed-site wireless terminal transceiver means for establishing wireless two-way communications with at least a few of said plurality of said fixed-site transceiver means over a plurality of communication links on said mutually-common frequencies of said fixed-site transceiver means;

using said non-fixed-site wireless terminal transceiver means for managing exchange of said targeted information packets and control packets with said plurality of fixed-site transceiver means and in particular with said few fixed-site transceiver means;

using said non-fixed-site wireless terminal transceiver means for distributing said targeted information packets of a single originating message among said few of said fixed-site transceiver means, such that said targeted information packets are interleaved among a plurality of said transceiver means;

using said fixed-site transceiver means for forwarding said targeted information packets of said single originating message to a single destination terminal means, said single destination terminal means operative to reassemble said information packets into a single message while eliminating redundant packets; and

using said destination terminal means to receive said targeted information packets of a single message via a plurality of said mutually-common frequencies.

15. A digital packet communication network comprising:

a plurality of mobile wireless transceivers that originate, transmit, and receive packets, ultimate destination addresses and intermediate destination addresses being included within said packets;

a plurality of fixed-site wireless repeaters, each said wireless repeater including a single receiver that receives packets, a single transmitter that relays packets received by said single receiver, each said wireless repeater modifying intermediate address information of said packets after receipt by said single receiver and prior to transmission by said single transmitter; and

a destination transceiver that exchanges packets with at least one of said fixed-site wireless repeaters, said destination transceiver being coupled to a wired network and exchanging packets with a terminal coupled to said wired network, said destination transceiver relaying packets for ultimate receipt by selected ones of said mobile wireless transceivers;

each said single receiver directly receiving packets from selected ones of said plurality of mobile wireless transceivers and selected ones of said plurality of fixed-site wireless repeaters that are within communications range; and

each said single transmitter directly transmitting packets to selected ones of said plurality of mobile wireless transceivers, said plurality of fixed-site wireless repeaters, and said destination transceiver that are within communications range.

16. The packet communication network of claim 15 wherein each said repeater selects an available frequency for transmission of each packet to be relayed from a plurality of predetermined frequencies.

17. The packet communication network of claim 16 wherein said plurality of predetermined frequencies is the same for transmission to said mobile transceivers and for transmission to said fixed-site repeaters.