Method for routing via access terminals
View Patent ↗An access-terminal routing methodology is provided that may be used to enable a wireless, meshed backhaul between base stations using existing wireless-access resources (time, bandwidth, code-space, power), protocols, and base station infrastructure. Accordingly, the invention provides a means to extend the coverage of existing networks by adding standalone base stations without wired or specialized wireless backhaul.
1. In a wireless communication system including an access terminal and first and second base stations, a method for the access terminal comprising:
providing the access terminal with an air interface protocol, the air interface protocol including a first mode supporting personal area network-based functions and a second mode supporting radio access network-based functions complimentary with an air interface protocol of the first and second base stations;
providing the access terminal with a capability to operate in an access mode wherein the access terminal is operable to receive a message transmitted by at least one of the base stations and in turn transmit a response message to the transmitting base station;
providing the access terminal with a capability to operate in a backhaul mode wherein the access terminal is operable to receive a message transmitted by the first base station and in turn retransmit the message to the second base station;
triggering the access terminal to switch between access mode and the backhaul mode upon receipt of a signaling message from one of the at least two base stations; and
providing the access terminal with a capability to determine allocation of air interface resources in either access mode or backhaul mode based on a combination of the signaling message and a resource constraint of the access terminal, wherein the resource constraint includes at least one of a pilot signal strength and a channel quality of service to one of the at least two base stations, and wherein determining the allocation of air interface resources includes estimating at least one air interface resource setting in either access mode or backhaul mode.
2. The method of claim 1 including the further step of:
providing at least one of the base stations with a capability to locate and route messages from source to intended destination.
3. The method of claim 1 including the further step of:
providing an enabling protocol to enable access terminals and networks to negotiate and cooperate among one another.
4. The method of claim 1 wherein air-interface resources are dynamically shared between the access and backhaul modes using a single set of device protocols.
5. A system comprising an access terminal established to maintain a concurrent air interface with at least a first base station and a second base station, the access terminal further including:
a capability to operate in an access mode wherein the access terminal is operable to receive a message transmitted by at least one of the first or second base stations and in turn transmit a response message to the transmitting base station;
a capability to operate in a backhaul mode wherein the access terminal is operable to receive a message transmitted by the first base station and in turn retransmit the message to the second base station;
triggering means for triggering the access terminal to switch between the access mode and the backhaul mode upon receipt of a signaling message from one of the first or second base stations; and
a capability to determine allocation of air interface resources in either access mode or backhaul mode based on a combination of the signaling message and a resource constraint of the access terminal, wherein the resource constraint includes at least one of a pilot signal strength and a channel quality of service to one of the at least two base stations, and wherein the capability to determine allocation of air interface resources includes a capability to estimate an appropriate allocation of an air interface resource for either an access mode or backhaul mode transmission.
6. The access terminal of claim 5 further established to concurrently receive two or more independent data streams from base stations to which the access terminal is transmitting data.
7. The access terminal of claim 6 wherein the access terminal transmits data received by it on a downlink from one base station via an uplink to another base station.
8. the access terminal of claim 7 further including a selector in the access terminal operative to determine the uplink on which data received on a particular downlink is to be transmitted.
9. The access terminal of claim 7 wherein the data received on a particular downlink is retransmitted on more than one uplink.
10. The access terminal of claim 5 wherein the access terminal is owned and operated by a service provider of a wireless communication system including at least one of the first and second base stations.
11. The access terminal of claim 5 wherein transmissions between a given one of the first or second base stations and the access terminal are Frequency Division Duplexed.
12. The access terminal of claim 5 further including a determination by the access terminal of supportable data rates on each uplink-downlink channel pair based on control signaling transmitted between itself and ones of the first and second base stations.
13. The access terminal of claim 12 wherein the access terminal reports said supportable data rates in response to a solicitation for operation on the backhaul mode by the access terminal.
14. The access terminal of claim 5 established at a given location to provide wireless system coverage extension.
15. The access terminal of claim 5 wherein at least one of the first and second base stations is a Femtocell and the access terminal provides signaling and control for autoconfiguring the Femtocell.
16. The access terminal of claim 5 wherein the access terminal is established to monitor and report measurements and alarms for at least one of the first and second base stations.