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Tone hopping methods and apparatus

a technology of tones and hopping, applied in the field of communication systems, to achieve the effect of limiting the number of collisions

Active Publication Date: 2009-05-14
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about methods and apparatus for allocating and using tones in a multi-tone multi-sector, multi-cell communications system. The invention minimizes repeated collisions between uplink tone hopping sequences in a predictable manner even when the tones used in neighboring base stations are misaligned. The invention uses functions to allocate tones to uplink tone hopping sequences that are designed to minimize repeated collisions. The invention also takes into account cell and sector identifiers to determine which function to use for each sector. The invention allows for efficient allocation of tones for uplink communication from wireless terminals in large geographic areas. The invention is particularly useful in an OFDM system.

Problems solved by technology

Such frequency misalignment may be due to base station clock errors or other frequency discrepancies between base stations.

Method used

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  • Tone hopping methods and apparatus

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Embodiment Construction

[0048]FIG. 1 shows an exemplary communication system 100 implemented in accordance with the present invention including multiple cells: cell 1102, cell M 104. Note that neighboring cells 102, 104 overlap slightly, as indicated by cell boundary region 168, thereby providing the potential for signal collisions between signals being transmitted by wireless devices in neighboring cells. Each cell 102, 104 of exemplary system 100 includes three sectors. Cells which have not be subdivided into multiple sectors (N=1), cells with two sectors (N=2) and cells with more than 3 sectors (N>3) are also possible in accordance with the invention. Cell 102 includes a first sector, sector 1110, a second sector, sector 2112, and a third sector, sector 3114. Each sector 110, 112, 114 has two sector boundary regions; each boundary region is shared between two adjacent sectors. Sector boundary regions provide the potential for signal collisions between signals being transmitted by wireless devices in nei...

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Abstract

Methods and apparatus for allocating and hopping tones for uplink communications purposes in adjacent sectors and neighboring cells of an OFDM system are described. Physical tones used in each sector and cell are allocated to tone hopping sequences according to a tone to tone hopping sequence allocation function which uses both a cell identifier and sector identifier. Different sectors and cells use different tone to tone hopping sequence allocation functions through the use of different cell and / or sector identifiers to minimize the number of collisions between hopping sequences of adjacent sectors and neighboring cells. Uplink tone hopping sequences, corresponding to logical tones are allocated to uplink communications channels. Uplink communications channels are used by wireless terminals, e.g., mobile nodes, to transmit data to base stations. Over time, a wireless terminal uses the tones included in the uplink tone hopping sequences corresponding to uplink communications channels it is authorized to use.

Description

RELATED APPLICATIONS [0001] The present application claims the benefit of U.S. Provisional Patent Application Ser. No. 60 / 717,701, filed on Sep. 16, 2005, titled “TONE HOPPING METHODS AND APPARATUS”, which is hereby expressly incorporated by reference.FIELD OF THE INVENTION [0002] The present invention relates to communications systems and, more particularly, to methods and apparatus for allocating tones, e.g., in a cellular communications network. BACKGROUND [0003] In a cellular wireless system, a service area is divided into a number of coverage zones generally referred to as cells. Each cell may be further subdivided into a number of sectors. Wireless terminals in a cell communicate with the base station that serves the cell. Wireless terminals may include a wide range of mobile devices including, e.g., cell phones and other mobile transmitters such as personal data assistants with wireless modems. [0004] A problem with known cellular communications systems is that transmission b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04J3/22H04B1/713H04W72/54
CPCH04B1/713H04L27/2601H04W16/24H04W16/12H04W16/02H04J11/00
Inventor JIN, HUILI, JUNYI
Owner QUALCOMM INC
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