MULTI-CARRIER COMMUNICATIONS WITH GROUP-BASED SUBCARRIER ALLOCATION

• US 20090279498A1
• Filed: 05/22/2009
• Published: 11/12/2009
• Est. Priority Date: 12/15/2000
• Status: Active Grant

• Current Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Original Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Inventors: Yin, Hujun, Li, Xiaodong, Liu, Hui, Mu, Fuqi, Xing, Guanbin
• Granted Patent: US 7,933,244 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/02 Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]

Abstract

A method and apparatus for subcarrier selection for systems is described. In one embodiment, the system employs orthogonal frequency division multiple access (OFDMA). In one embodiment, a method for subcarrier selection comprises a subscriber measuring channel and interference information for subcarriers based on pilot symbols received from a base station, the subscriber selecting a set of candidate subcarriers, providing feedback information on the set of candidate subcarriers to the base station, and receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber.

Claims

1-26. -26. (canceled)

27. A cellular network using OFDMA channels for communication, the network comprising:

a plurality of cells;

a base station in each of the plurality of cells, wherein each base station allocates groups of clusters based on priority assigned to each group of said groups of clusters, said priority being based on the cell of the plurality of cells in which said each base station resides.

28. The network defined in claim 27 wherein priority orders are designed to enable selective assignment of a cluster of subcarriers to avoid interference while reducing a probability of causing interference with existing assignments of one or more clusters of subcarriers.

29. A method for minimizing inter-cell interference in a cellular network using OFDMA channels for communication, said method comprising:

partitioning each of a plurality of cells into a plurality of sectors;

partitioning subcarriers into a plurality of groups of one or more clusters of subcarriers; and

allocating, at a base station, at least one group in said plurality of groups to at least one of said sectors, said allocating being based on the location of the cell in which said base station is located with respect to other cells in said plurality of cells.

30. The method of claim 29 wherein a first portion of said sectors is allocated a first portion of available clusters of subcarriers and a second portion of said sectors is allocated a second portion of available clusters of subcarriers.

31. The method of claim 30 wherein said first portion of said sectors is one half of said plurality of sectors.

32. The method of claim 30 wherein said first portion of available clusters of subcarriers is one half of said available clusters

33. The method of claim 30 further comprising:

assigning, at said base station, priority to each of said plurality of groups to be allocated as traffic load increases, wherein the priority is based on the interference the cell in which said base station is located causes to other cells in said plurality of cells and the interference said cell in which said base station is located receives from other cells in said plurality of cells.

34. A cellular network using OFDMA channels for communication, said network comprising:

a plurality of cells, each cell having a plurality of sectors;

a plurality of groups of one or more clusters of subcarriers; and

a base station in each of a plurality of cells, wherein said base station allocates at least one group in said plurality of groups to at least one of said sectors, said allocating being based on the location of the cell in which said base station resides with respect to other cells in said plurality of cells.

35. The network of claim 34 wherein said base station allocates a first portion of available clusters of subcarriers to a first portion of said sectors and further allocates a second portion of available clusters of subcarriers to a second portion of said sectors.

36. The network of claim 35 wherein said first portion of said sectors is one half of said plurality of sectors.

37. The network of claim 35 wherein said first portion of available clusters of subcarriers is one half of said available clusters.

38. The network of claim 35 said base station prioritizes each of said plurality of groups in an order to be allocated as traffic load increases, wherein the priority is based on the interference caused by the cell in which said base station is located to other cells in said plurality of cells and the interference received from other cells in said plurality of cells by said cell in which said base station is located.