Patent US5290511A successfully refreshed from Google Patents.
EP0720405A2
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EP
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Multiple access cellular communication with dynamic slot allocation and reduced co-channel interference
Assignee: Alcatel Lucent SAS
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Filing: 1995-12-11
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Granted: —
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Expires: 2015-12-11
Abstract
Abstract An apparatus and method reduces co-channel interference in multiple-access cellular communication systems in which frame time or frequency slots are allocated between uplink and downlink. An omnidirectional antenna or a set of directional antennas are used in each cell base station to communicate with users. The frame slots (710,715,720) in which the antennas communicate uplink and downlink information are arranged in accordance with a predetermined frame organization to reduce mixed co-channel interference (CCI). Mixed CCI occurs when a downlink transmission from one base station antenna in a given cell interferes with uplink reception in another base station antenna in a frequency reuse (FR) cell. A potentially-interfering antenna in a given cell is therefore directed to transmit downlink information in a different portion of the frame than that in which a potentially-interfered-with antenna in the frequency reuse cell receives uplink information. The frame slots may be allocated such that only a portion (720) of the available slots are dynamically allocated in accordance with user demand, while the remaining portions are assigned to either uplink (710) or downlink (715) communication.
Inventors
- 👤 Haralabos C. Papadopoulos
- 👤 Carl-Erik W. Sundberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 19:55
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/50; H04W72/54; H04W72/541; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04B7/2656; H04J; H04J3/00; H04J3/16; H04J3/1694; H04W16/00; H04W16/02; H04W16/12; H04W16/24; H04W72/04; H04W72/044; H04W72/0446; H04W74/00; H04W74/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
150 words
A communication system for communicating information in slots of a frame, the system comprising: a first base station associated with a first cell and adapted to transmit downlink information to users in the first cell and to receive uplink information from users in the first cell, the first base station including a potentially-interfering antenna; a second base station associated with a frequency reuse cell and adapted to transmit downlink information to users in the frequency reuse cell and to receive uplink information from users in the frequency reuse cell, the second base station including a potentially-interfered-with antenna, wherein the potentially-interfering antenna can interfere with reception of uplink information in the potentially-interfered-with antenna; and means for allocating the slots to users in each of the cells such that the potentially-interfering antenna transmits downlink information in a different portion of the frame than that in which the potentially-interfered-with antenna receives uplink information.
Claim 2
Dependent Claim
46 words
The system of claim 1 wherein at least a portion of the slots in the frame are allocated dynamically such that given slots in the portion are allocated to either uplink or downlink communication in accordance with demand from the users in each of the cells.
Claim 3
Dependent Claim
65 words
The system of claim 1 wherein a first portion of the slots in the frame are assigned to uplink communication, a second portion of the slots in the frame are assigned to downlink communication, and a third portion of the slots in the frame are dynamically allocated to either uplink or downlink communication in accordance with demand from the users in each of the cells.
Claim 4
Dependent Claim
21 words
The system of claim 1 wherein at least one of the potentially-interfering antenna and the potentially-interfered-with antenna is an omnidirectional antenna.
Claim 5
Dependent Claim
41 words
The system of claim 1 wherein the first base station has a first set of directional antennas which includes the potentially-interfering antenna, and further wherein the second base station has a second set of directional antennas which includes the potentially-interfered-with antenna.
Claim 6
Independent Claim
155 words
A method of communicating information in allocated slots of a frame in a communication system, wherein the system includes a first base station associated with a first cell and adapted to transmit downlink information to users in the first cell and to receive uplink information from users in the first cell, the method comprising the steps of: providing a second base station associated with a frequency reuse cell and adapted to transmit downlink information to users in the frequency reuse cell and to receive uplink information from users in the frequency reuse cell, wherein the first base station includes a potentially-interfering antenna which can interfere with reception of uplink information in a potentially-interfered-with antenna in the second base station; and allocating the slots to users in each of the cells such that the potentially-interfering antenna transmits downlink information in a different portion of the frame than that in which the potentially-interfered-with antenna receives uplink information.
Claim 7
Dependent Claim
46 words
The method of claim 6 wherein the step of allocating the slots further includes the step of dynamically allocating slots in at least a portion of the the frame to either uplink or downlink communication depending on demand from the users in each of the cells.
Claim 8
Dependent Claim
69 words
The method of claim 6 wherein the step of allocating the slots further includes: assigning a first portion of the slots in the frame to uplink communication; assigning a second portion of the slots in the frame to downlink communication; and dynamically allocating a third portion of the slots in the frame to either uplink or downlink communication depending on demand from the users in each of the cells.
Claim 9
Dependent Claim
51 words
The method of claim 6 wherein the first base station has a first set of directional antennas which includes the potentially-interfering antenna and further wherein the step of providing the second base station includes providing the second base station with a second set of directional antennas which includes the potentially-interfered-with antenna.
Claim 10
Dependent Claim
90 words
In a communication system adapted to communicate information in allocated frame slots on an uplink and downlink between a user and a base station in a cell, a method of allocating slots comprising the steps of: assigning a first portion of a plurality of slots in a frame for communication on the uplink; assigning a second portion of the plurality of slots for communication on the downlink; and dynamically allocating slots in a third portion of the plurality of slots to uplink communication or downlink communication in accordance with demand.
Claim 11
Dependent Claim
119 words
In a communication system in which information is communicated in slots of a frame between a base station in a given system cell and users in that cell, an apparatus comprising: antenna means in the given cell arranged to transmit downlink information to the users in the given cell and to receive uplink information from the users in the given cell, wherein the antenna means includes a potentially-interfering antenna which can interfere with reception of uplink information in a frequency reuse cell; and means for allocating the slots to users in the given cell such that the potentially-interfering antenna transmits downlink information in different slots of the frame than those in which the frequency reuse cell receives uplink information.
Claim 12
Dependent Claim
64 words
The apparatus of claim 1 or 11 wherein the antenna means comprises a set of directional antennas, and the means for allocating the slots includes a processor adapted to receive status information identifying which of the directional antennas in the set is being used, and to direct the allocation of a slot to the particular user in accordance with a predetermined slot-direction frame organization.
Claim 13
Dependent Claim
40 words
The apparatus of claim 5 or 1 wherein the means for allocating the slots provides a slot allocation such that the directional antennas cell receive uplink information in one order and transmit downlink information in another order within the frame.
Claim 14
Dependent Claim
125 words
In a communication system in which information is communicated in slots of a frame between a base station in a given system cell and users in that cell, a method of allocating the slots comprising the steps of: providing antenna means in the given cell arranged to transmit downlink information to the users in the given cell and to receive uplink information from the users in the given cell, wherein the antenna means includes a potentially-interfering antenna which can interfere with reception of uplink information in a frequency reuse cell; and allocating the slots to users in the given cell such that the potentially-interfering antenna transmits downlink information in different slots of the frame than those in which the frequency reuse cell receives uplink information.
Claim 15
Dependent Claim
24 words
The method of claim 14 wherein the step of providing antenna means includes providing a set of directional antennas which include the potentially-interfering antenna.
Claim 16
Dependent Claim
55 words
The method of claim 15 wherein the step of allocating the slots further includes the steps of: identifying which of the directional antennas in the set is being used to communicate with a particular user in the given cell; and allocating a slot to the particular user in accordance with a predetermined slot-direction frame organization.
Claim 17
Independent Claim
46 words
The method of claims 9, 10 or 15 wherein the step of allocating the slots further includes allocating a portion of the slots such that a set of directional antennas receive uplink information in one order and transmit downlink information in another order within the frame.
References Cited (Backward Citations)
No citation records indexed.
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