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Physical layer automatic repeat request (arq) system and method

A technology of physical layer and wireless communication system, applied in the field of wireless communication system, can solve the problems of slow signal, large buffer buffer, long retransmission interval, etc.

Inactive Publication Date: 2007-02-14
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Layer 2 ARQ signaling is usually slow, requiring large buffers and long retransmission intervals

Method used

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  • Physical layer automatic repeat request (arq) system and method
  • Physical layer automatic repeat request (arq) system and method
  • Physical layer automatic repeat request (arq) system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Figure 1A and Figure 1B It shows a downlink physical ARQ 10 and an uplink physical ARQ 20 respectively.

[0011] The downlink physical ARQ 10 includes a base station 12 receiving packets from a higher layer ARQ transmitter 14a located in a network 14 . Packets from the higher layer ARQ transmitter 14a will be applied to the physical layer ARQ transmitter 12a in the base station 12 . The physical layer ARQ transmitter 12a is guided by a forward error correction (FEC) code, additional error checking sequence (ECS), by an adaptive modulation and coding (AMC) controller 12c and uses binary phase shift keying ( BPSK), quadrature phase shift keying (QPSK), or m-ary quadrature amplitude modulation (ie, 16-QAM or 64-QAM) to modulate data. In addition, for Orthogonal Frequency Division Multiplexing Access (OFDMA), the physical layer AMC controller 12c may change the subchannels used to carry packet data. The physical layer ARQ transmitter 12 a transmits packets to the subsc...

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PUM

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Abstract

A physical automatic request repeat system comprises a transmitter and a receiver. A physical layer transmitter, at the transmitter, receives data and formats the received data into packets having a particular encoding / data modulation. The physical layer transmitter contains n channels which transmit the packets and retransmits packets in response to not receiving a corresponding acknowledgment for a given packet. An adaptive modulation and coding controller in the transmitter collects retransmission statistics and adjusts the particular encoding / data modulations using the collected statistics. The receiver has a physical layer n-channel receiver for receiving the packets. The receiver contains an n-channel hybrid ARQ combiner / decoder which combines packet transmissions, decodes packets and detects packet errors. The receiver contains an acknowledgment transmitter which transmits an acknowledgment for each packet, if that packet has an acceptable error rate. The receiver contains an insequence delivery element which delivers acceptable packets lo higher layers.

Description

technical field [0001] The present invention relates to a wireless communication system. More specifically, the present invention relates to a modification of the system implemented using a physical layer (PHY) automatic repeat request (ARQ) scheme. Background technique [0002] Proposes Broadband Fixed Wireless Access (BFWA) communications using Single Carrier-Frequency Domain Equalization (SC-FDE) or Orthogonal Frequency Division Multiplexing (OFDM) methods when using a High Speed ​​Downlink Packet Access (HSDPA) application system. This application will send downlink packet data at high speed. In BFWA, a building or group of buildings are connected to each other by wireless or wired and operate as a single subscriber station. The data volume requirements of this system are extremely large, so that multiple users of a single station need a large bandwidth. [0003] The currently proposed system uses a Layer 2 Automatic Repeat Request (ARQ) system. Packets that cannot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/216H04L1/16H04B1/69H04B7/00H04B7/155H04B7/26H04J11/00H04L1/00H04L1/18H04L1/20H04L12/54H04L27/26H04L29/08H04W88/08
CPCH04L2001/0096H04L1/0009H04W88/08H04L1/1845Y02B60/31Y02B60/50H04L1/1812H04L1/1809H04L1/0034H04L1/1822H04B7/2612
Inventor 约瑟夫A·克瓦克
Owner INTERDIGITAL TECH CORP