Patent US4118135A successfully refreshed from Google Patents.
Patent US5710762A successfully refreshed from Google Patents.
US5710762A
Expired / Lapsed
US
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Frame structure having non-symmetrical slot assignments for mobile communications
Assignee: Cirrus Logic Inc
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Filing: 1995-06-06
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Granted: 1998-01-20
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Expires: 2015-06-06
Abstract
Abstract An improved frame structure for use in mobile communications systems utilizing slotted protocols is provided. According to the present invention, consecutive slots in a frame are assigned to each mobile unit so that the mobile unit transmits to a base station during the first slot and receives a transmission from the base station during the second slot. This frame structure, permits the mobile unit to monitor various frequencies for a longer and more continuous period of time. It is important for the mobile unit to have enough time to monitor frequencies while it is not transmitting or receiving so that base station handoff and interference avoidance handoff techniques can be performed by the mobile communications system. Furthermore, according to the frame structure provided by the present invention, the mobile units can be designed with a standard frequency synthesizer. The improved frame structure also allows channel distortion to be minimized by providing adaptive equalization with transmit precompensation and/or antenna diversity in the base stations.
Inventors
- 👤 James E. Petranovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:21
CPC Classifications
H; H04; H04W; H04W74/00; H04W74/04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04B7/2656; H04W24/00; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
171 words
A frame structure for use in a full duplex frequency channel of a wireless communications system having at least one central station and a plurality of peripheral stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising: an uplink time slot in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in which said at least one central station transmits back a signal precompensated for channel distortions to said one of the plurality of peripheral stations; and wherein the time (Tud) from the start of said uplink time slot in a first frame and the start of said downlink time slot in the first frame is less than the time (Tdu) from the start of said downlink time slot in the first frame and the start of said uplink time slot in a second frame where the second frame is substantially adjacent and later in time to said first frame.
Claim 2
Dependent Claim
171 words
A frame structure for use in a full duplex frequency channel of a wireless communications system having at least one central station and a plurality of peripheral stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising: an uplink time slot in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in which said at least one central station transmits back a signal precompensated for channel distortions to said one of the plurality of peripheral stations; and wherein the time (Tud) from the start of said uplink time slot in a first frame and the start of said downlink time slot in the first frame is less than the time (Tdu) from the start of said downlink time slot in the first frame and the start of said uplink time slot in a second frame where the second frame is substantially adjacent and later in time to said first frame.
Claim 3
Dependent Claim
19 words
The frame structure as recited in claim 1, wherein the ratio of Tdu to Tud is at least 3.
Claim 4
Dependent Claim
20 words
The frame structure as recited in claim 1, wherein the ratio of Tdu to Tud is approximately equal to 3.
Claim 5
Dependent Claim
20 words
The frame structure as recited in claim 1, wherein the ratio of Tdu to Tud is approximately equal to 7.
Claim 6
Dependent Claim
41 words
The frame structure as recited in claim 2, wherein the wireless communication system is a mobile terrestrial communications system in which said at least one central station is a stationary base station and said plurality of peripheral stations are mobile units.
Claim 7
Dependent Claim
27 words
The frame structure as recited in claim 5, wherein the slotted protocol is one of a time division multiple access protocol and a time division duplexing protocol.
Claim 8
Dependent Claim
27 words
The frame structure as recited in claim 6, wherein each of said peripheral stations use a single frequency synthesizer to upconvert for transmission and downconvert for reception.
Claim 9
Dependent Claim
193 words
A frame structure for use in a full duplex frequency channel of a wireless communications system having at least one central station and a plurality of peripheral stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising: an uplink time slot in a first frame in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in the first frame in which said at least one central station transmits back a signal pre-compensated for channel distortions to said one of the plurality of peripheral stations; and an uplink time slot in a second frame substantially adjacent and later in time to said first frame in which said one of the plurality of peripheral stations transmits back to the at least one central station, wherein the number of slots (Sud) between the uplink time slot in the first frame and the downlink time slot in the first frame is less than the number of slots (Sdu) between the downlink time slot in the first frame and the uplink time slot in the second frame.
Claim 10
Dependent Claim
193 words
A frame structure for use in a full duplex frequency channel of a wireless communications system having at least one central station and a plurality of peripheral stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising: an uplink time slot in a first frame in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in the first frame in which said at least one central station transmits back a signal pre-compensated for channel distortions to said one of the plurality of peripheral stations; and an uplink time slot in a second frame substantially adjacent and later in time to said first frame in which said one of the plurality of peripheral stations transmits back to the at least one central station, wherein the number of slots (Sud) between the uplink time slot in the first frame and the downlink time slot in the first frame is less than the number of slots (Sdu) between the downlink time slot in the first frame and the uplink time slot in the second frame.
Claim 11
Dependent Claim
20 words
The frame structure as recited in claim 8, wherein Sud is equal to 0 and Sdu is equal to 6.
Claim 12
Dependent Claim
41 words
The frame structure as recited in claim 8, wherein the wireless communication system is a mobile terrestrial communications system in which said at least one central station is a stationary base station and said plurality of peripheral stations are mobile units.
Claim 13
Dependent Claim
27 words
The frame structure as recited in claim 10, wherein the slotted protocol is one of a time division multiple access protocol and a time division duplexing protocol.
Claim 14
Dependent Claim
16 words
The frame structure of claim 8, wherein the slotted protocol is a time division duplexing protocol.
Claim 15
Dependent Claim
26 words
The frame structure of claim 8, wherein each of said stations uses a single frequency synthesizer to up convert for transmission and down convert for reception.
Claim 16
Dependent Claim
20 words
The system of claim 8, wherein said base station provides adaptive equalization with transmit pre-compensation to substantially minimize channel distortion.
Claim 17
Dependent Claim
201 words
A frame structure for use in a full duplex frequency channel of a wireless communication system having at least one central station and a plurality of peripheral stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising: an uplink time slot in a first frame in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in the first frame in which said at least one central station transmits back a signal pre-compensated for signal distortions to said one of the plurality of peripheral stations; and an uplink time slot in a second frame substantially adjacent and later in time to said first frame in which said one of the plurality of peripheral stations transmits back to the at least one central station, wherein the time (Tud) from the start of said uplink time slot in the first frame and the start of said downlink time slot in the first frame is less than the time (Tdu) from the start of said downlink time slot in the first frame and the start of said uplink time slot in the second frame.
Claim 18
Dependent Claim
201 words
A frame structure for use in a full duplex frequency channel of a wireless communication system having at least one central station and a plurality of peripheral stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising: an uplink time slot in a first frame in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in the first frame in which said at least one central station transmits back a signal pre-compensated for signal distortions to said one of the plurality of peripheral stations; and an uplink time slot in a second frame substantially adjacent and later in time to said first frame in which said one of the plurality of peripheral stations transmits back to the at least one central station, wherein the time (Tud) from the start of said uplink time slot in the first frame and the start of said downlink time slot in the first frame is less than the time (Tdu) from the start of said downlink time slot in the first frame and the start of said uplink time slot in the second frame.
Claim 19
Dependent Claim
19 words
The frame structure as recited in claim 15, wherein the ratio of Tdu to Tud is at least 3.
Claim 20
Dependent Claim
20 words
The frame structure as recited in claim 15, wherein the ratio of Tdu to Tud is approximately equal to 3.
Claim 21
Dependent Claim
20 words
The frame structure as recited in claim 15, wherein the ratio of Tdu to Tud is approximately equal to 7.
Claim 22
Dependent Claim
41 words
The frame structure as recited in claim 16, wherein the wireless communication system is a mobile terrestrial communications system in which said at least one central station is a stationary base station and said plurality of peripheral stations are mobile units.
Claim 23
Dependent Claim
27 words
The frame structure as recited in claim 19, wherein the slotted protocol is one of a time division multiple access protocol and a time division duplexing protocol.
Claim 24
Dependent Claim
218 words
A frame structure for use in a full duplex frequency channel of a mobile terrestrial communication system having at least one stationary base station and a plurality of mobile unit stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame; comprising: an uplink time slot in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in which said at least one central station transmits back a signal precompensated for signal distortions to said one of the plurality of peripheral stations; and wherein the ratio of time (Tud) from the start of said uplink time slot in a first frame and the start of said downlink time slot in the first frame to the time (Tdu) from the start of said downlink time slot in the first frame and the start of said uplink time slot in a second frame is at least 3 where the second frame is substantially adjacent and later in time to said first frame, the slotted protocol is one of a time division multiple access protocol and a time division duplexing protocol, and each of said mobile unit stations use a single frequency synthesizer to up convert for transmission and down convert for reception.
Claim 25
Dependent Claim
218 words
A frame structure for use in a full duplex frequency channel of a mobile terrestrial communication system having at least one stationary base station and a plurality of mobile unit stations in which stations communicate data using a slotted protocol having a predetermined number of slots in a frame; comprising: an uplink time slot in which one of the plurality of peripheral stations transmits to the at least one central station; a downlink time slot in which said at least one central station transmits back a signal precompensated for signal distortions to said one of the plurality of peripheral stations; and wherein the ratio of time (Tud) from the start of said uplink time slot in a first frame and the start of said downlink time slot in the first frame to the time (Tdu) from the start of said downlink time slot in the first frame and the start of said uplink time slot in a second frame is at least 3 where the second frame is substantially adjacent and later in time to said first frame, the slotted protocol is one of a time division multiple access protocol and a time division duplexing protocol, and each of said mobile unit stations use a single frequency synthesizer to up convert for transmission and down convert for reception.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-19 | 2001-07-21 | 2002-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-19 | 2005-07-21 | 2006-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-19 | 2009-07-21 | 2010-01-20 | $7700.00 | Window Closed / Lapsed |