US5930248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio communication system selectively using multicast with variable offset time
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1997-03-04
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Granted: 1999-07-27
•
Expires: 2017-03-04
Abstract
Abstract A digital base station improves downlink coverage by allocating multicast and non-multicast channels based on the propagation property of an RF link between a mobile unit and a base station. The non-multicast channels are time slots during which information is transmitted from one antenna, and multicast channels are time slots during which information is transmitted from multiple diversity antennas. Transmission timing is offset from the diversity antennas by an amount that corresponds to the multipath propagation properties of the RF link.
Inventors
- 👤 Carl Erik Joakim Langlet
- 👤 Bo Anders Granstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:12
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0686; H04B7/0691
Claims Analysis
Total Claims: 83
Claim 1
Independent Claim
145 words
A digital communication system for providing communication coverage over radio frequency (RF) channels that are subdivided into a plurality of time slots during which information is communicated with at least one mobile unit, comprising: a base station including a plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and a controller that allocates multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 2
Dependent Claim
145 words
A digital communication system for providing communication coverage over radio frequency (RF) channels that are subdivided into a plurality of time slots during which information is communicated with at least one mobile unit, comprising: a base station including a plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and a controller that allocates multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 3
Dependent Claim
34 words
The communication system of claim 1, wherein the information is transmitted on the multicast channels from at least two antennas at separate times that are offset from each other by a multicast offset time.
Claim 4
Dependent Claim
17 words
The communication system of claim 2, wherein the multicast offset time is set to a fixed value.
Claim 5
Dependent Claim
31 words
The communication system of claim 2, wherein the multicast offset time corresponds to a measure of multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 6
Dependent Claim
32 words
The communication system of claim 4, wherein the multicast offset time corresponds to a time when the least amount of energy is detected from various propagation paths of an uplink RF channel.
Claim 7
Dependent Claim
28 words
The communication system of claim 5, wherein the base station includes an equalizer for providing a correlator response that indicates when the least amount of energy is present.
Claim 8
Dependent Claim
29 words
The communication system of claim 6, wherein the correlator response is provided within a correlator time window, and wherein the multicasting offset time is within the correlator time window.
Claim 9
Dependent Claim
59 words
The communication system of claim 4, wherein the base station includes a plurality of radio transceivers having corresponding receiver and transmitter sections coupled to the antennas, wherein an idle receiver section of the radio transceiver whose transmitter section is used for multicasting measures the multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 10
Dependent Claim
26 words
The communication system of claim 1, wherein the measure of the propagation property corresponds to a measure of the received signal strength at the mobile unit.
Claim 11
Dependent Claim
25 words
The communication system of claim 1, wherein the measure of the propagation property corresponds to a measure of bit error rate at the mobile unit.
Claim 12
Dependent Claim
28 words
The communication system of claim 1, wherein the measure of the propagation property corresponds to a measure of propagation delay of a signal transmitted from the mobile unit.
Claim 13
Dependent Claim
36 words
The communication system of claim 1, wherein the base station measures co-channel interference level of RF channels, wherein the controller is responsive to the measure of co-channel interference level for selecting the multicast and non-multicast channels.
Claim 14
Dependent Claim
29 words
The communication system of claim 12, wherein the co-channel interference level is measured on an active channel in response to a message indicating the mobile unit will stop transmitting.
Claim 15
Dependent Claim
16 words
The communication system of claim 12, wherein the co-channel interference level is measured during idle channels.
Claim 16
Dependent Claim
39 words
The communication system of claim 1, wherein the base station includes a plurality of transmitter sections coupled to the antennas and a baseband bus for selective addressing of the transmitter sections for transmitting during the non-multicast or multicast channels.
Claim 17
Dependent Claim
24 words
The communication system of claim 1, wherein the controller allocates the multicast and non-multicast channels based on fault reports received from the base station.
Claim 18
Dependent Claim
14 words
The communication system of claim 1, wherein the antennas are configured for space diversity.
Claim 19
Dependent Claim
14 words
The communication system of claim 1, wherein the antennas are configured for polarization diversity.
Claim 20
Dependent Claim
143 words
A digital communication system for providing communication coverage using radio frequency (RF) channels over which information is communicated with at least one mobile unit, comprising: a base station including a plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; wherein the information is transmitted on the multicast channels from at least two of the antennas at separate times that are offset from each other by a multicast offset time that corresponds to a first measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 21
Dependent Claim
143 words
A digital communication system for providing communication coverage using radio frequency (RF) channels over which information is communicated with at least one mobile unit, comprising: a base station including a plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; wherein the information is transmitted on the multicast channels from at least two of the antennas at separate times that are offset from each other by a multicast offset time that corresponds to a first measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 22
Dependent Claim
106 words
The communication system of claim 19, wherein the RF channel is divided into time slots, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and wherein the communication system further includes a controller that allocates multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a second measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 23
Dependent Claim
17 words
The communication system of claim 19, wherein the multicast offset time is set to a fixed value.
Claim 24
Dependent Claim
31 words
The communication system of claim 19, wherein the multicast offset time corresponds to a measure of multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 25
Dependent Claim
32 words
The communication system of claim 22, wherein the multicast offset time corresponds to a time when the least amount of energy is detected from various propagation paths of an uplink RF channel.
Claim 26
Dependent Claim
28 words
The communication system of claim 23, wherein the base station includes an equalizer for providing a correlator response that indicates when the least amount of energy is present.
Claim 27
Dependent Claim
29 words
The communication system of claim 24, wherein the correlator response is provided within a correlator time window, and wherein the multicasting offset time is within the correlator time window.
Claim 28
Dependent Claim
59 words
The communication system of claim 22, wherein the base station includes a plurality of radio transceivers having corresponding receiver and transmitter sections coupled to the antennas, wherein an idle receiver section of the radio transceiver whose transmitter section is used for multicasting measures the multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 29
Dependent Claim
27 words
The communication system of claim 20, wherein the second measure of the propagation property corresponds to a measure of the received signal strength at the mobile unit.
Claim 30
Dependent Claim
26 words
The communication system of claim 20, wherein the second measure of the propagation property corresponds to a measure of bit error rate at the mobile unit.
Claim 31
Dependent Claim
29 words
The communication system of claim 20, wherein the second measure of the propagation property corresponds to a measure of propagation delay of a signal transmitted from the mobile unit.
Claim 32
Dependent Claim
36 words
The communication system of claim 20, wherein the base station measures co-channel interference level of RF channels, wherein the controller is responsive to the measure of co-channel interference level for selecting the multicast and non-multicast channels.
Claim 33
Dependent Claim
30 words
The communication system of claim 30, wherein the co-channel interference level is measured on an active channel in response to a message indicating that the mobile unit will stop transmitting.
Claim 34
Dependent Claim
16 words
The communication system of claim 30, wherein the co-channel interference level is measured on idle channels.
Claim 35
Dependent Claim
39 words
The communication system of claim 20, wherein the base station includes a plurality of transmitter sections coupled to the antennas and a baseband bus for selective addressing of the transmitter sections for transmitting during the non-multicast or multicast channels.
Claim 36
Dependent Claim
25 words
The communication system of claim 20, wherein the switch controller allocates the multicast and non-multicast channels based on fault reports received from the base station.
Claim 37
Dependent Claim
14 words
The communication system of claim 19, wherein the antennas are configured for space diversity.
Claim 38
Dependent Claim
14 words
The communication system of claim 19, wherein the antennas are configured for polarization diversity.
Claim 39
Dependent Claim
143 words
A base station for transmitting over RF channels that are subdivided into a plurality of time slots during which information is communicated with at least one mobile unit, comprising: a plurality of transmitters that couple to a plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and a controller that allocates multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 40
Dependent Claim
143 words
A base station for transmitting over RF channels that are subdivided into a plurality of time slots during which information is communicated with at least one mobile unit, comprising: a plurality of transmitters that couple to a plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and a controller that allocates multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 41
Dependent Claim
34 words
The base station of claim 37, wherein the information is transmitted on the multicast channels from at least two antennas at separate times that are offset from each other by a multicast offset time.
Claim 42
Dependent Claim
17 words
The base station of claim 38, wherein the multicast offset time is set to a fixed value.
Claim 43
Dependent Claim
31 words
The base station of claim 38, wherein the multicast offset time corresponds to a measure of multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 44
Dependent Claim
40 words
The base station of claim 40, wherein the multicast offset time corresponds to a time when the least amount of energy is detected from various propagation paths of an uplink RF channel linking the mobile unit to the base station.
Claim 45
Dependent Claim
29 words
The base station of claim 41, wherein the base station further includes an equalizer for providing a correlator response that indicates when the least amount of energy is present.
Claim 46
Dependent Claim
29 words
The base station of claim 42, wherein the correlator response is provided within a correlator time window, and wherein the multicasting offset time is within the correlator time window.
Claim 47
Dependent Claim
63 words
The base station of claim 40, wherein the base station further includes a plurality of radio transceivers having corresponding receiver and transmitter sections coupled to the antennas, wherein an idle receiver section of the radio transceiver whose transmitter section is used for multicasting measures the multipath propagation property of at least one uplink RF channel linking the mobile unit to the base station.
Claim 48
Dependent Claim
38 words
The base station of claim 37, wherein the measure of the propagation property of the RF channels linking the mobile unit to the base station corresponds to a measure of the received signal strength at the mobile unit.
Claim 49
Dependent Claim
37 words
The base station of claim 37, wherein the measure of the propagation property of the RF channels linking the mobile unit to the base station corresponds to a measure of bit error rate at the mobile unit.
Claim 50
Dependent Claim
42 words
The base station of claim 37, wherein the measure of the propagation property of the RF channels linking the mobile unit to the base station corresponds to a measure of the multipath propagation property of a signal transmitted from the mobile unit.
Claim 51
Dependent Claim
36 words
The base station of claim 37, wherein the base station measures co-channel interference level of RF channels, wherein the controller is responsive to the measure of co-channel interference level for selecting the multicast and non-multicast channels.
Claim 52
Dependent Claim
28 words
The base station of claim 48, wherein the co-channel interference level is measured on an active channel in response to a message indicating the mobile unit stop transmitting.
Claim 53
Dependent Claim
16 words
The base station of claim 48, wherein the co-channel interference level is measured during idle channels.
Claim 54
Dependent Claim
38 words
The base station of claim 37, wherein the base station includes a plurality of transmitter sections coupled to the antennas and a baseband bus for selective addressing of the transmitter sections for transmitting the non-multicast or multicast channels.
Claim 55
Dependent Claim
25 words
The base station of claim 37, wherein the switch controller allocates the multicast and non-multicast channels based on fault reports received from the base station.
Claim 56
Dependent Claim
14 words
The base station of claim 37, wherein the antennas are configured for space diversity.
Claim 57
Dependent Claim
14 words
The base station of claim 37, wherein the antennas are configured for polarization diversity.
Claim 58
Dependent Claim
135 words
A base station for transmitting information to a mobile unit over radio frequency (RF) channels, comprising: a plurality of transmitters coupled to a corresponding plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; wherein the information is transmitted on the multicast channels from at least two antennas at separate times that are offset from each other by a multicast offset time that corresponds to a first measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 59
Dependent Claim
135 words
A base station for transmitting information to a mobile unit over radio frequency (RF) channels, comprising: a plurality of transmitters coupled to a corresponding plurality of antennas for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; wherein the information is transmitted on the multicast channels from at least two antennas at separate times that are offset from each other by a multicast offset time that corresponds to a first measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 60
Dependent Claim
106 words
The base station of claim 55, wherein the RF channel is divided into time slots, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and wherein the base station further includes a controller that allocates multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a second measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 61
Dependent Claim
17 words
The base station of claim 55, wherein the multicast offset time is set to a fixed value.
Claim 62
Dependent Claim
31 words
The base station of claim 55, wherein the multicast offset time corresponds to a measure of multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 63
Dependent Claim
40 words
The base station of claim 58, wherein the multicast offset time corresponds to a time when the least amount of energy is detected from various propagation paths of an uplink RF channel linking the mobile unit to the base station.
Claim 64
Dependent Claim
28 words
The base station of claim 59, wherein the base station includes an equalizer for providing a correlator response that indicates when the least amount of energy is present.
Claim 65
Dependent Claim
29 words
The base station of claim 60, wherein the correlator response is provided within a correlator time window, and wherein the multicast offset time is within the correlator time window.
Claim 66
Dependent Claim
59 words
The base station of claim 58, wherein the base station includes a plurality of radio transceivers having corresponding receiver and transmitter sections coupled to the antennas, wherein an idle receiver section of the radio transceiver whose transmitter section is used for multicasting measures the multipath propagation property of the RF channels linking the mobile unit to the base station.
Claim 67
Dependent Claim
22 words
The base station of claim 56, wherein the measure corresponds to a measure of the received signal strength at the mobile unit.
Claim 68
Dependent Claim
36 words
The base station of claim 56, wherein the measure of the propagation property of the RF channel for selecting the multicast and non-multicast channels corresponds to a measure of bit error rate at the mobile unit.
Claim 69
Dependent Claim
36 words
The base station of claim 56, wherein the base station measures co-channel interference level of RF channels, wherein the controller is responsive to the measure of co-channel interference level for selecting the multicast and non-multicast channels.
Claim 70
Dependent Claim
30 words
The base station of claim 65, wherein the co-channel interference level is measured on an active channel in response to a message indicating that the mobile unit will stop transmitting.
Claim 71
Dependent Claim
16 words
The base station of claim 65, wherein the co-channel interference level is measured during idle channels.
Claim 72
Dependent Claim
39 words
The base station of claim 56, wherein the base station includes a plurality of transmitter sections coupled to the antennas and a baseband bus for selective addressing of the transmitter sections for transmitting during the non-multicast or multicast channels.
Claim 73
Dependent Claim
24 words
The base station of claim 56, wherein the controller allocates the multicast and non-multicast channels based on fault reports received from the base station.
Claim 74
Dependent Claim
14 words
The base station of claim 55, wherein the antennas are configured for space diversity.
Claim 75
Dependent Claim
14 words
The base station of claim 55, wherein the antennas are configured for polarization diversity.
Claim 76
Independent Claim
134 words
A method of communicating information between a base station with a plurality of antennas and at least one mobile unit over radio frequency (RF) channels that are subdivided into a plurality of time slots, comprising: transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and allocating multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 77
Independent Claim
134 words
A method of communicating information between a base station with a plurality of antennas and at least one mobile unit over radio frequency (RF) channels that are subdivided into a plurality of time slots, comprising: transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and allocating multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 78
Independent Claim
138 words
An apparatus for communicating information between a base station with a plurality of antennas and at least one mobile unit over radio frequency (RF) channels that are subdivided into a plurality of time slots, comprising: means for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and means for allocating multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 79
Independent Claim
138 words
An apparatus for communicating information between a base station with a plurality of antennas and at least one mobile unit over radio frequency (RF) channels that are subdivided into a plurality of time slots, comprising: means for transmitting the information to the mobile unit on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are time slots during which the information is transmitted from only one of the antennas, and the multicast channels are other time slots during which the same information is transmitted from more than one of the antennas; and means for allocating multicast and non-multicast channels for use in transmitting the information to the mobile unit based on a measure of the propagation property of at least one of the RF channels linking the mobile unit to the base station.
Claim 80
Independent Claim
149 words
A method of communicating information between a base station and at least one mobile unit over radio frequency (RF) channels, comprising: transmitting the information to the mobile units from a plurality of antennas on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; measuring the propagation property of at least one of the RF channels linking the mobile unit to the base station; and offsetting the transmission of the information on the multicast channels from at least two antennas at separate times by a multicast offset time that corresponds to the measure of the propagation property of the at least one of the RF channels linking the mobile unit to the base station.
Claim 81
Independent Claim
149 words
A method of communicating information between a base station and at least one mobile unit over radio frequency (RF) channels, comprising: transmitting the information to the mobile units from a plurality of antennas on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; measuring the propagation property of at least one of the RF channels linking the mobile unit to the base station; and offsetting the transmission of the information on the multicast channels from at least two antennas at separate times by a multicast offset time that corresponds to the measure of the propagation property of the at least one of the RF channels linking the mobile unit to the base station.
Claim 82
Independent Claim
152 words
An apparatus for communicating information between a base station and at least one mobile unit over radio frequency (RF) channels, comprising: means for transmitting the information to the mobile units from a plurality of antennas on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; means for measuring the propagation property of at least one of the RF channels linking the mobile unit to the base station; and means for offsetting the transmission of the information on the multicast channels from antennas at separate times by a multicast offset time that corresponds to the measure of the propagation property of the at least one of the RF channels linking the mobile unit to the base station.
Claim 83
Independent Claim
152 words
An apparatus for communicating information between a base station and at least one mobile unit over radio frequency (RF) channels, comprising: means for transmitting the information to the mobile units from a plurality of antennas on any one of a number of multicast and non-multicast channels, wherein the non-multicast channels are RF channels for transmitting the information from only one of the antennas, and the multicast channels are RF channels for transmitting the information from more than one of the antennas; means for measuring the propagation property of at least one of the RF channels linking the mobile unit to the base station; and means for offsetting the transmission of the information on the multicast channels from antennas at separate times by a multicast offset time that corresponds to the measure of the propagation property of the at least one of the RF channels linking the mobile unit to the base station.
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