EP1565017A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of operating TDD/virtual FDD hierarchical cellular telecommunication system
Assignee: University of Edinburgh
•
Filing: 2004-12-30
•
Granted: —
•
Expires: 2024-12-30
Abstract
Abstract A method of constructing a micro- or pico-cells and a virtual macro-cell hierarchical cellular system structure comprising contiguous cells each containing a base station and sectors, wherein a virtual cell comprising three surrounding FDD macro-cell base stations over underlay the TDD micro- or pico-cells. In the proposed TDD/virtual FDD hierarchical cellular structure, a method of locating underlay cells' base station and macro-cells' base station to keep a least interference distance and a method of aligning the TDD micro-or pico-cells' sectors antenna beam direction with the FDD macro-cells' sectors beam direction are proposed, such that this system can suppress the additional inter-system interference and adjacent channel interference. The algorithm of utilising and borrowing the underused FDD macro-cells' resource and the mechanism of deciding the feasible resource borrowing region and smart antenna applicable region is proposed in such a way that the radio network controller and TDD micro- or pico-cell base stations can build up and decide the preference list of which sector, users, and resource to be served, which eventually resulting in the flexible and adaptive radio resource management of the RNC and achieving the optimal utilisation of the overall system resource.
Inventors
- 👤 Sang-Boh Yun
- 👤 Sung-Hyun Cho
- 👤 Yung-Soo Kim
- 👤 Eung-Sun Kim
- 👤 Yeon-Woo Lee
- 👤 Stephen Mclaughlin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:36
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/24; H04W16/32; H04W16/28
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
76 words
A cellular communication system supporting at least two different
duplexing schemes, comprising: a plurality of mobile stations; at least one first fixed station communicating with the mobile stations using a
first duplexing scheme, the first fixed station defining a macro cell; and at least one second fixed station communicating with the mobile stations
using a second duplexing scheme, the second fixed station defining a micro or pico
cell located inside a boundary of the macro cell.
Claim 2
Dependent Claim
18 words
A cellular communication system of claim 1, wherein the first duplexing
scheme is a frequency division duplexing (FDD).
Claim 3
Dependent Claim
21 words
A cellular communication system of claim 1 or claim 2, wherein the
second duplexing scheme is a time division duplexing (TDD).
Claim 4
Dependent Claim
31 words
A cellular communication system of claim 1, wherein the macro cell is
sectored at an azimuth angle so as to form a plurality of macro sectors each having
an identical size.
Claim 5
Dependent Claim
37 words
A cellular communication system of claim 4, wherein the micro cell is
sectored at the same azimuth angle with the macro cell so as to form as many micro
sectors as the number of the macro sectors.
Claim 6
Dependent Claim
18 words
A cellular communication system of claim 5, wherein the micro cell
locates in one of the macro sectors.
Claim 7
Dependent Claim
20 words
A cellular communication system of claim 6, wherein each macro or micro
sector is identified by a unique sector code.
Claim 8
Dependent Claim
36 words
A cellular communication system of claim 7, wherein the mobile station
located at the micro sector can borrow underused resources assigned for the macro
sector of which azimuth is identical with that of the micro sector.
Claim 9
Dependent Claim
27 words
A cellular communication system of claim 8, wherein the first and second
fixed stations form sector beams using adaptive beamforming antennas for focusing
on the mobile stations.
Claim 10
Dependent Claim
14 words
A cellular communication system of claim 4, wherein the azimuth angle
is 120 degree.
Claim 11
Dependent Claim
85 words
A cellular communication system supporting at least two different
duplexing schemes, comprising: a plurality of mobile stations; at least three first fixed stations communicating with the mobile stations using
a first-duplexing scheme, the first fixed stations defining respective macro cells that
are contiguous and a virtual cell; and a micro or pico cell cluster including at least one second fixed station
communicating with the mobile stations using a second-duplexing scheme, the
second fixed station defining a micro or pico cell located in the virtual cell.
Claim 12
Dependent Claim
33 words
A cellular communication system of claim 11, wherein each macro cell is
sectored so as to form three macro sectors having respective sector beams directed
from the first fixed station at different angles.
Claim 13
Dependent Claim
35 words
A cellular communication system of claim 11 or 12, wherein the micro
cell is sectored so as to form three micro sectors having respective sector beams
directed from the second fixed station at different angles.
Claim 14
Dependent Claim
33 words
A cellular communication system of claim 12, wherein the micro cell is
sectored so as to form three micro sectors having respective sector beams directed
from the second fixed station at different angles.
Claim 15
Dependent Claim
21 words
A cellular communication system of claim 14, wherein the macro and
micro sectors are distinguished from each other by sector specific-codes.
Claim 16
Dependent Claim
32 words
A cellular communication system of claim 14, wherein the virtual cell is
formed with three macro sectors of which sector beams are directed from the
different first fixed stations at different angles.
Claim 17
Dependent Claim
31 words
A cellular communication system of claim 16, wherein the sector beam of
each macro sector has a main lobe in parallel with a main lobe of any of the micro
sectors.
Claim 18
Dependent Claim
21 words
A cellular communication system of claim 17, wherein the micro cell
cluster is located at a center of the virtual cell.
Claim 19
Dependent Claim
34 words
A cellular communication system of claim 18, wherein the mobile stations
located at the micro sector can borrow underused resources assigned for the macro
sector having identical main lobe direction in the virtual cell.
Claim 20
Dependent Claim
28 words
A cellular communication system of claim 19, wherein the first and
second fixed stations form the sector beams using adaptive beamforming antennas
for focusing on the mobile terminals.
Claim 21
Dependent Claim
90 words
A cellular communication system supporting both a time division
duplexing (TDD) scheme and a frequency division duplexing (FDD) scheme,
comprising; a plurality of mobile stations; at least three FDD fixed stations communicating with the mobile stations
based on the FDD scheme, the FDD fixed stations defining respective macro cells
that are contiguous and a virtual cell; and a cluster including at least one TDD fixed station communicating with the
mobile stations based on the TDD scheme, the TDD fixed station defining a micro or
pico cell in the virtual cell.
Claim 22
Dependent Claim
16 words
A cellular communication system of claim 21, wherein the cluster locates
coaxially with the virtual cell.
Claim 23
Dependent Claim
34 words
A cellular communication system of claim 22, wherein each macro cell is
sectored at azimuth angles so as to form three macro sectors covered by respective
sector beams directed from the FDD fixed station.
Claim 24
Dependent Claim
40 words
A cellular communication system of claim 23, wherein each micro cell is
sectored at the azimuth angles as for the macro sector so as to form three micro
sectors covered by respective sector beams directed from the TDD fixed station.
Claim 25
Dependent Claim
28 words
A cellular communication system of claim 24, wherein the virtual cell is
formed with three macro sectors belonged to the different macro cells formed at
different azimuth angles.
Claim 26
Dependent Claim
37 words
A cellular communication system of claim 25, wherein the mobile station
located at the micro sector can borrow underused resources assigned for the macro
sector of which azimuth angle is identical with that of the micro sector.
Claim 27
Dependent Claim
28 words
A cellular communication system of claim 26, wherein the FDD and
TDD fixed stations form the sector beams using adaptive beamforming antennas for
focusing on the mobile stations.
Claim 28
Independent Claim
74 words
A method for constructing cellular communication system supporting
communications between fixed stations and mobile stations based on both a
frequency division duplexing (FDD) and a time division duplexing (TDD) schemes,
comprising: forming at least three contiguous macro cells defined by respective FDD-based
fixed stations; forming at least one cluster including at least one micro or pico cell defined
by a TDD-based fixed station; and forming a virtual cell surrounded by the FDD-based fixed stations.
Claim 29
Dependent Claim
14 words
A method of claim 28, wherein the cluster locates coaxially with the
virtual cell.
Claim 30
Dependent Claim
32 words
A method of claim 29, wherein each macro cell is sectored at azimuth
angles so as to form three macro sectors covered by respective sector beams directed
from the FDD-based fixed station.
Claim 31
Dependent Claim
38 words
A method of claim 30, wherein each micro cell is sectored at the azimuth
angles as for the macro sector so as to form three micro sectors covered by
respective sector beams directed from the TDD-based fixed station.
Claim 32
Dependent Claim
26 words
A method of claim 31, wherein the virtual cell is formed with three
macro sectors belonged to the different macro cells formed at different azimuth
angles.
Claim 33
Dependent Claim
37 words
A cellular communication system of claim 32, wherein the mobile station
located at the micro sector can borrow underused resources assigned for the macro
sector of which azimuth angle is identical with that of the micro sector.
Claim 34
Dependent Claim
26 words
A method of claim 33, wherein the FDD- and TDD-based fixed stations
form the sector beams using adaptive beamforming antennas for focusing on the
mobile stations.
Claim 35
Independent Claim
105 words
A method for allocating radio resource in cellular communication system
supporting communications between fixed stations and mobile stations based on
both a frequency division duplexing (FDD) and a time division duplexing (TDD)
scheme, comprising: receiving, at a TDD fixed station, a call request from a TDD mobile station; determining whether or not TDD resource is available; allocating the TDD resource to the TDD mobile station when the TDD
resource is available; borrowing FDD resource from a FDD fixed station, when the TDD resource
is not available; and allocating the FDD resource to the TDD mobile station according to an
priority of the TDD mobile station.
Claim 36
Dependent Claim
55 words
A method of claim 35, wherein the borrowing resource further comprises: determining whether or not underused FDD resource available at any FDD
carrier: determining whether or not to borrow underused FDD resource if the
underused resource available; determining a priority of the TDD mobile station if it is determined to borrow
the underused FDD resource.
Claim 37
Dependent Claim
29 words
A method of claim 36, wherein the borrowing resource further comprises
determining whether or not to apply an adaptive beamforming for determining the
priority of the TDD mobile station.
Claim 38
Dependent Claim
91 words
A method of claim 36, wherein the determining whether or not to borrow
the underused FDD resource includes: allowing the TDD mobile station to measure a first intersystem interference
( I MS_inter-sys ); comparing the first intersystem interference ( I MS_inter-sys ) received from the
TDD mobile station with a predetermined first interference margin threshold
( I TH_MS ); and determining to borrow the underused FDD resource when the first intersystem
interference ( I MS_inter-sys ) is less than or equal to the first interference margin threshold
( I TH_MS ).
Claim 39
Dependent Claim
25 words
A method of claim 38, wherein the first intersystem interference ( I MS_inter- sys ) is from FDD mobile stations to the TDD mobile station.
Claim 40
Dependent Claim
78 words
A method of claim 37, wherein the determining whether or not to apply
the adaptive beamforming includes: measuring at the TDD fixed station a second inter system interference
( I BS_inter-sys ); comparing the second inter-system interference ( I BS_inter-sys ) with a second
interference margin threshold ( I TH_BS ); and applying the adaptive beamforming when the second inter-system interference
( I BS_inter-sys ) is not less than the second interference margin threshold ( I TH_BS ).
Claim 41
Dependent Claim
25 words
A method of claim 40, wherein the second inter system interference
( I BS_inter-sys ) is from FDD mobile stations to the TDD fixed station.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.