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Methods and systems for wireless networks with relays

a wireless network and relay technology, applied in the field of wireless communication, can solve the problems of limited data rate and gaps in coverage of the given cell, increased complexity of the system, and increased spectrum efficiency penalty,

Inactive Publication Date: 2013-01-03
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method to avoid collisions when multiple mobile relay stations move across a network. This is done by defining a reserved sub-set of PN indexes for each mobile relay station to avoid collisions. The technical effect of this method is to improve network efficiency and reliability for mobile relay stations.

Problems solved by technology

One drawback of such wireless networks is that MSs near an edge of the given cell suffer performance loss due to interference from other cells in cellular networks and propagation loss in non-cellular networks which results in limited data rates and gaps in coverage of the given cell.
While soft hand off can be used in cellular networks to improve performance to some extent for MSs at the cell edge, the improved performance comes at the cost of additional system complexity and a spectrum efficiency penalty.

Method used

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  • Methods and systems for wireless networks with relays
  • Methods and systems for wireless networks with relays
  • Methods and systems for wireless networks with relays

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Embodiment Construction

[0074]In accordance with embodiments of the invention, various physical layer designs and procedures are provided for enabling relay based communications that may find applications in an IEEE 802.16 based network. The concepts described herein are not, however, limited in this regard and may be applicable to any OFDM based systems, such as 3GPP and 3GPP2 evolutions.

[0075]FIG. 1 shows an example of a wireless system, for example an OFDM network that includes relays. Shown is a base station (BS) 130 that is in communication with one or more mobile stations (MS), only one shown MS-1132, and one or more first tier relay stations (RS), only one shown RS-1138. Some of the first tier (one hop away from BS) relay stations are in communication with one or more second tier (two hops away from BS) relay stations. RS and MS the same number of hops away from the BS are said to be in the same tier. In the illustrated example RS-1138 is in communication with second tier RS-2140. Each relay station...

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Abstract

Methods and systems are provided for use with wireless networks having one or more cell in which each cell includes a base station (BS), at least one relay station (RS) and at least one mobile station (MS). The at least one relay station can be used as an intermediate station for providing communication between the BS and MS. Methods are provided for allocating OFDM resources for communicating between the BS, RS and / or MS for example dividing transmission resources into uplink and downlink transmissions and methods of inserting pilot symbols into transmission resources used by the RS. In some embodiments on the invention, the methods are consistent and / or can be used in conjunction with existing standards such as 802.16e.

Description

RELATED APPLICATIONS[0001]This application is a divisional application of U.S. patent application Ser. No. 12 / 300,522 filed on Nov. 12, 2008, which claims the benefit of and is a National Phase Entry of International Application No. PCT / CA2007 / 000965 filed May 31, 2007, and claims the benefit of U.S. Provisional Patent Application Nos. 60 / 809,341 filed on May 31, 2006, 60 / 822,960 filed on Aug. 21, 2006, 60 / 863,873 filed on Nov. 1, 2006 and 60 / 870,417 filed on Dec. 18, 2006, which are all hereby incorporated by reference in their entirety.FIELD OF THE INVENTION[0002]The invention relates to the field of wireless communications, more specifically to systems and methods for supporting Orthogonal Frequency Division Multiplexed (OFDM) communication using relays.BACKGROUND OF THE INVENTION[0003]Orthogonal frequency division multiplexing (OFDM) is a form of multiplexing that distributes data over a number of carriers that have a very precise spacing in the frequency domain. The precise spa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04W72/04
CPCH04B7/155H04W88/04H04W84/047H04W72/04H04B7/14H04L27/2601H04W72/0446
Inventor ZHANG, HANGMA, JIANGLEIZHU, PEIYINGFONG, MO-HANTONG, WEN
Owner APPLE INC