Multiple access cellular communication with dynamic slot allocation and reduced co-channel interferences
First Claim
1. 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.
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0 Petitions
Accused Products
Abstract
An apparatus and method for reducing 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 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 of the available slots are dynamically allocated in accordance with user demand, while the remaining portions are assigned to either uplink or downlink communication.
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Citations
34 Claims
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1. A communication system for communicating information in slots of a frame, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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:
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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. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. 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:
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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. - View Dependent Claims (20)
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21. 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:
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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. - View Dependent Claims (22, 23, 24, 25)
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26. 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:
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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. - View Dependent Claims (27, 28, 29, 30)
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31. A communication system for communicating information in slots of a frame, the system comprising:
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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, 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. - View Dependent Claims (32)
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33. 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:
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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, wherein the step of allocating the slots further includes the step of dynamically allocating slots in at least a portion of the frame to either uplink or downlink communication depending on demand from the users in each of the cells.
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34. An apparatus for communicating information in slots of a frame in a system including 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, the apparatus comprising:
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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 the frequency reuse cell 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.
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Specification