Source: http://www.google.com/patents/US7965618?dq=6,631,400
Timestamp: 2017-10-18 10:33:26
Document Index: 284768603

Matched Legal Cases: ['§119', 'art 16', 'art 16', 'art 16', 'art 16', 'art 16', 'art 16', 'Application No. 0616479', 'Application No. 0622122', 'Application No. 0622124']

Patent US7965618 - Communication systems - Google Patents
In accordance with one embodiment of the present invention, a wireless transmission method for use in a multi-hop wireless communication system includes determining for a particular transmission at least one measure of the expected link characteristics for at least two links of a communication path,...http://www.google.com/patents/US7965618?utm_source=gb-gplus-sharePatent US7965618 - Communication systems
Publication number US7965618 B2
Application number US 11/840,492
Also published as EP1890395A1, US20080043709
Publication number 11840492, 840492, US 7965618 B2, US 7965618B2, US-B2-7965618, US7965618 B2, US7965618B2
Inventors Yuefeng Zhou, Michael John Beems Hart
Patent Citations (39), Non-Patent Citations (54), Referenced by (12), Classifications (19), Legal Events (2)
US 7965618 B2
In accordance with one embodiment of the present invention, a wireless transmission method for use in a multi-hop wireless communication system includes determining for a particular transmission at least one measure of the expected link characteristics for at least two links of a communication path, and for each of those links, configuring a particular transmission window by setting its shape and/or a transmission format to be used in that window in dependence upon the measure for that link only. Furthermore, the method includes, during that particular transmission, transmitting information along those links using, for each of those links, the particular transmission window for that link.
This application claims foreign priority benefits under 35 U.S.C. §119 of United Kingdom Application No. GB 0616471.9, filed on Aug. 18, 2006, entitled “Communication Systems”.
COMMUNICATION SYSTEMS, United Kingdom Application No. GB 0616478.4, filed on Aug. 18, 2006;
COMMUNICATION SYSTEMS, United Kingdom Application No. GB 0616475.0, filed on Aug. 18, 2006; and
COMMUNICATION SYSTEMS, United Kingdom Application No. GB 0616476.8, filed on Aug. 18, 2006.
This invention relates in general to communication systems, and more particularly to burst profile re-dimensioning schemes.
In a multi-hop communication system, communication signals are sent in a communication direction along a communication path (C) from a source apparatus to a destination apparatus via one or more intermediate apparatuses. FIG. 8 illustrates a single-cell two-hop wireless communication system comprising a base station BS (known in the context of 3 G communication systems as “node-B” NB) a relay node RN (also known as a relay station RS) and a user equipment UE (also known as mobile station MS). In the case where signals are being transmitted on the downlink (DL) from a base station to a destination user equipment (UE) via the relay node (RN), the base station comprises the source station (S) and the user equipment comprises the destination station (D). In the case where communication signals are being transmitted on the uplink (UL) from a user equipment (UE), via the relay node, to the base station, the user equipment comprises the source station and the base station comprises the destination station. The relay node is an example of an intermediate apparatus (I) and comprises: a receiver, operable to receive data from the source apparatus; and a transmitter, operable to transmit this data, or a derivative thereof, to the destination apparatus.
FIGS. 9A & 9B illustrate a number of applications for relay stations. For fixed infrastructure, the coverage provided by a relay station may be “in-fill” to allow access to the communication network for mobile stations which may otherwise be in the shadow of other objects or otherwise unable to receive a signal of sufficient strength from the base station despite being within the normal range of the base station. “Range extension” is also shown, in which a relay station allows access when a mobile station is outside the normal data transmission range of a base station. One example of in-fill shown at the top right of FIG. 9A is positioning of a nomadic relay station to allow penetration of coverage within a building that could be above, at, or below ground level.
x ( t ) = 1 N ∑ n = 0 N - 1 c n · ⅇ j2π n Δ f t , 0 ≤ t ≤ T s ( 1 )
In accordance with one embodiment of the present invention, a wireless transmission method for use in a multi-hop wireless communication system is provided. The system includes at least three communication apparatuses, one said communication apparatus comprising a source apparatus, another said communication apparatus comprising a destination apparatus and the other said communication apparatus comprising an intermediate apparatus. Said source apparatus is operable to transmit information in a transmission window in a communication direction along a communication path extending from the source apparatus to the destination apparatus via the intermediate apparatus. The transmission window has a shape defined by a transmission frequency bandwidth profile over a transmission interval, and the communication path includes a series of two or more consecutive links from the source apparatus to the destination apparatus. The intermediate apparatus is operable to receive information from a previous communication apparatus in said communication direction and to transmit the received information in such a transmission window to a subsequent apparatus in said communication direction. The wireless transmission method for use in such a multi-hop wireless communication system includes determining for a particular transmission at least one measure of the expected link characteristics for at least two links of the communication path, and for each of those links, configuring a particular transmission window by setting its shape and/or a transmission format to be used in that window in dependence upon the measure for that link only. Furthermore, the method includes, during that particular transmission, transmitting information along those links using, for each of those links, the particular transmission window for that link.
By using relay in wireless communication systems, both the quality of service (QoS) and the coverage can be improved. FIG. 1 shows two typical application scenarios of WiMAX relay. In FIG. 1.a, by using the relay stations (RS), more areas can be covered. In FIG. 1.b, the RS can improve the QoS for mobile stations (MS), which is suffering from the shadow of buildings. In this proposal, the RS 1# and RS 2# are called the first-hop RS, and the second-hop RS respectively; the MS1 # and MS 2# are called the second-hop MS and the third-hop MS respectively.
Normally, a service connection/flow of a MS will be arranged to using a proper permutation zone by the radio resource management algorithms in terms of QoS demands, radio channel conditions, and other factors. Within a permutation zone, a two-dimensional area of a group of subchannels will be allocated to a service connection of a MS. This two-dimensional allocation is called “burst”. The minimum allocation unit for a burst is slot in WiMAX. A burst may be visualized as a rectangle, which can be represented by NSubchannels×MOFDM — Symbols (FIG. 3).
4. A 2×D burst size controlling method is proposed in this patent. Based on mobility estimation, this 2×D burst size controlling method can improve the bit error rate performance.
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U.S. Classification 370/203, 370/348, 370/344, 370/319, 455/450
International Classification H04B7/208, H04B7/212, H04W72/00, H04L5/06
Cooperative Classification H04L1/0006, H04L1/0003, H04L1/0009, H04L2001/0097, H04W52/46, H04L5/0007, H04L5/0037
European Classification H04L1/00A3, H04W52/46, H04L5/00C2
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHOU, YUEFENG (NMI);HART, MICHAEL JOHN BEEMS;REEL/FRAME:019711/0296