[특허]Adaptive modulation for fixed wireless link in cable transmission system

Adaptive modulation for fixed wireless link in cable transmission system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-009/00 H04B-007/208 H04L-027/30 H04W-072/00
출원번호	US-0206183 (2011-08-09)
등록번호	US-8659987 (2014-02-25)
발명자 / 주소	Hartman, Jr., David L.
출원인 / 주소	Broadcom Corporation
대리인 / 주소	Sterne, Kessler, Goldstein & Fox P.L.L.C.
인용정보	피인용 횟수 : 0 인용 특허 : 62

초록 ▼

In one embodiment of a communications network, the predetermined encoding scheme and symbol constellation configurations are chosen so that the range in channel qualities that the encoding scheme and symbol constellation configurations are designed to be utilized within overlap with each other. This overlapping provides hysteresis, which reduces the frequency with which a subscriber must alter encoding scheme and symbol constellations. Reducing the frequency of changing encoding scheme and/or symbol constellation eliminates the communication overhead associated with these changes and increases throughput by enabling the subscriber to spend more time transmitting data.

대표청구항 ▼

1. A method for allocating bandwidth to a subscriber, comprising: allocating a current bandwidth allocation to the subscriber for transmitting a traffic stream that is encoded using a first set from among a plurality of sets of encoding schemes and symbol constellations, the current bandwidth allocation being sufficient to meet quality of service (QoS) requirements for the traffic stream that are provided by the subscriber;determining if the current bandwidth allocation is sufficient to meet the QoS requirements for the traffic stream that are provided by the subscriber for a second set from among the plurality of sets of encoding schemes and symbol constellations if used for transmitting the traffic stream;instructing the subscriber to change its encoding scheme and symbol constellation to the second set when the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber; andreceiving the traffic stream that is encoded using the second set from the subscriber. 2. The method of claim 1, wherein the determining further comprises: determining if the current minimum bandwidth allocation is greater than a bandwidth required to meet the QoS requirements for the traffic stream that are provided by the subscriber; andre-allocating excess bandwidth from among the current bandwidth allocation that is not required to meet the QoS requirements for the traffic stream that are provided by the subscriber to other subscribers. 3. The method of claim 1, wherein the allocating comprises: allocating time slots to the subscriber for transmitting the traffic stream. 4. The method of claim 3, wherein the allocating time slots to the subscriber comprises: allocating minislots to the subscriber for transmitting the traffic stream. 5. The method of claim 1, wherein the instructing comprises: measuring a quality of the traffic stream;determining the second set based upon the quality of the received traffic stream;instructing the subscriber to change its encoding scheme to the encoding scheme from the second set when its encoding scheme differs from the encoding scheme from the second set when the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber; andinstructing the subscriber to change its symbol constellation to the symbol constellation from the second set when its symbol constellation differs from the symbol constellation from the second set when the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber. 6. The method of claim 1, wherein at least one of the sets of encoding schemes and symbol constellations utilizes as its respective encoding scheme one of: Reed-Solomon encoding configured to correct a number of byte errors per codeword; ora convolutional encoding of a rate. 7. The method of claim 1, wherein at least one of the sets of encoding schemes and symbol constellations utilizes as its respective symbol constellation one of: Quadrature Phase Shift Keying (QPSK);16 Quadrature Amplitude Modulation (16-QAM); or64 Quadrature Amplitude Modulation (64-QAM). 8. An apparatus for allocating bandwidth to a subscriber, comprising: a scheduler configured to allocate a current bandwidth allocation to the subscriber for transmitting a traffic stream that is encoded using a first set from among a plurality of sets of encoding schemes and symbol constellations, the current bandwidth allocation being sufficient to meet quality of service (QoS) requirements for the traffic stream that are provided by the subscriber;an encoding scheme and symbol constellation assignment block configured to: determine if the current bandwidth allocation is sufficient to meet the QoS requirements for the traffic stream that are provided by the subscriber for a second set from among the plurality of sets of encoding schemes and symbol constellations if used for transmitting the traffic stream, andinstruct the subscriber to change its encoding scheme and symbol constellation to the second set of the plurality of sets of encoding schemes and symbol constellations when the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber; anda receiver configured to receive the traffic stream that is encoded using the second set from the subscriber. 9. The apparatus of claim 8, wherein the encoding scheme and symbol constellation assignment block is further configured to: determine if the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber by determining if the current minimum bandwidth allocation is greater than a bandwidth required to meet the QoS requirements for the traffic stream that are provided by the subscriber, andre-allocate excess bandwidth from the current bandwidth allocation that is not required to meet the QoS requirements for the traffic stream that are provided by the subscriber to other subscribers. 10. The apparatus of claim 8, wherein the current bandwidth allocation is an allocation of time slots to the subscriber. 11. The apparatus of claim 10, wherein the current bandwidth allocation is an allocation of minislots to the subscriber. 12. The apparatus of claim 8, wherein the receiver is further configured to measure a quality of the traffic stream, and wherein the encoding scheme and symbol constellation assignment block is further configured to: determine the second set based upon the quality of the received traffic stream;instruct the subscriber to change its encoding scheme to the encoding scheme from the second set when its encoding scheme differs from the encoding scheme from the second set when the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber; andinstruct the subscriber to change its symbol constellation to the symbol constellation from the second set when its symbol constellation differs from the symbol constellation from the second set when the current bandwidth allocation meets the QoS requirements for the traffic stream that are provided by the subscriber. 13. The apparatus of claim 8, wherein at least one of the sets of encoding schemes and symbol constellations utilizes as its respective encoding scheme one of: Reed-Solomon encoding configured to correct a number of byte errors per codeword; ora convolutional encoding of a rate. 14. The apparatus of claim 8, wherein at least one of the sets of encoding schemes and symbol constellations utilizes as its respective symbol constellation one of: Quadrature Phase Shift Key (QPSK);16 Quadrature Amplitude Modulation (16-QAM); or64 Quadrature Amplitude Modulation (64-QAM).

이 특허에 인용된 특허 (62)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Adaptive modulation for fixed wireless link in cable transmission system 원문보기

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Adaptive modulation for fixed wireless link in cable transmission system 원문보기

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