Method of quality-based frequency hopping in a wirelesscommunication system
First Claim
1. A method in a wireless communications system that hops a transmission frequency of a channel from frequency to frequency after transmitting for a dwell interval at successive hopping frequencies, the method comprising the step of:
- causing, by operation of a processor, the dwell interval for successive hops to be varied in duration from hop to hop as a function of a channel quality metric, wherein the dwell interval for a current frequency hop is ended when the value of the channel quality metric indicates that the channel quality at the current frequency is degraded to a predetermined level; and
determining a frequency for the next frequency hop as the frequency among candidate next frequencies having a value of at least one metric associated with channel quality that is indicative of the highest channel quality.
5 Assignments
0 Petitions
Accused Products
Abstract
In a wireless communications system which hops from frequency to frequency, rather than hopping according to a fixed dwell interval and a pre-determined pseudo-random hop sequence, a quality-based frequency hopping methodology is defined in which a new frequency is hopped to when the channel quality on the current frequency degrades based on the measured value or values of one or more predetermined metrics that are associated with channel quality. When triggered to hop to a next frequency, the hop-to-frequency may be the next frequency in the pseudo-random hop sequence known to both the transmitter and receiver or, in order to improve the reliability of communications, may be determined based on channel quality measurements on different potential hop-to-frequencies.
-
Citations
19 Claims
-
1. A method in a wireless communications system that hops a transmission frequency of a channel from frequency to frequency after transmitting for a dwell interval at successive hopping frequencies, the method comprising the step of:
-
causing, by operation of a processor, the dwell interval for successive hops to be varied in duration from hop to hop as a function of a channel quality metric, wherein the dwell interval for a current frequency hop is ended when the value of the channel quality metric indicates that the channel quality at the current frequency is degraded to a predetermined level; and determining a frequency for the next frequency hop as the frequency among candidate next frequencies having a value of at least one metric associated with channel quality that is indicative of the highest channel quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method in a wireless communications system that hops a transmission frequency of a channel from frequency to frequency after transmitting for a dwell interval at successive hopping frequencies, the method comprising the step of:
-
causing, by operation of a processor, the dwell interval for successive hops to be varied in duration from hop to hop as a function of a channel quality metric, wherein the dwell interval for a current frequency hop is ended when the value of the channel quality metric indicates that the channel quality at the current frequency is degraded to a predetermined level; dynamically determining an available frequency space for the next frequency according to measured channel quality and one or more spectrum policies associated with different candidate frequency channels; and determining the next frequency using a pseudo-random sequence to provide an offset into the determined available frequency space.
-
-
18. A method in a wireless communications system that hops a transmission frequency of a channel from frequency to frequency after transmitting for a dwell interval at successive hopping frequencies, the method comprising the step of:
-
causing, by operation of a processor, the dwell interval for successive hops to be varied in duration from hop to hop as a function of a channel quality metric, wherein the dwell interval for a current frequency hop is ended when the value of the channel quality metric indicates that the channel quality at the current frequency is degraded to a predetermined level; and determining a frequency for the next frequency hop from a value in a pseudo-random sequence of frequencies in a fixed frequency space of a predetermined number of channels, the value in the pseudo-random sequence being the next value in the sequence that is associated with a frequency channel which has a value of at least one metric associated with channel quality that indicates a channel quality better than a predetermined level and that meets one or more spectrum policies.
-
-
19. A method in a wireless communications system that hops a transmission frequency of a channel from frequency to frequency after transmitting for a dwell interval at successive hopping frequencies, the method comprising the step of:
causing, by operation of a processor, the dwell interval for successive hops to be varied in duration from hop to hop as a function of a channel quality metric, wherein the dwell interval for a current frequency hop is ended when the value of the channel quality metric indicates that the channel quality at the current frequency is degraded to a predetermined level.
Specification