Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multicasting method, multicasting system, mobile station and base station

A multi-point transmission and transmission system technology, applied in the transmission system, digital transmission system, radio transmission system, etc., can solve the problems of large capacity waste, reduced system allowable capacity, and prolonged delay time, so as to reduce retransmission and shorten the time spent Time, reduce the effect of request resend

Inactive Publication Date: 2006-12-13
NTT DOCOMO INC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that according to the existing multicast signal transmission ARQ technology, it is necessary to pre-set a certain reserve interval for request retransmission, so the waste is relatively large in terms of capacity
In addition, there is a relatively high possibility of poor subsequent signal transmission due to NACK conflicts.
[0014] In addition, in the conventional multicast signal transmission, the base station sends the multicast signal requested to be retransmitted because it receives a NACK signal, so if a mobile station keeps requesting retransmission due to poor reception quality , not only increases the delay time, but also reduces the allowable capacity of the entire system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multicasting method, multicasting system, mobile station and base station
  • Multicasting method, multicasting system, mobile station and base station
  • Multicasting method, multicasting system, mobile station and base station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0049] Embodiment 1-1 of the present invention consists of image 3 and 4 give.

[0050] In this embodiment, if the base station obtains a received power greater than a certain threshold, it is regarded as a request for retransmission of the multicast signal. Here, the so-called certain threshold is set as the noise level.

[0051] image 3 It is a configuration diagram of the multicast transmission system of the first embodiment. Here, the difference from the multicast transmission system in the prior art is that the base station 121 has a received power detector 122, and the operation of the error detection / ARQ processor 133 of the mobile station 131 is different from that of the existing mobile station 11. / Actions of the ARQ processor 13 .

[0052] In the base station 121, the multicast signal input from the multicast signal input terminal 102 is input to the ARQ processor 103. The ARQ processor 103 divides the input multicast signal into units of slots, adds an err...

Embodiment 1-2

[0062] Below, refer to Figure 5 Examples 1-2 of the present invention will be described. In this embodiment, a diffusion code such as an orthogonal gold code (gold code) is used as a retransmission request signal.

[0063] Figure 5 It is a structural diagram of the multicast transmission system of Embodiment 1-2. Here, the difference from the prior art multicast transmission system is that the base station 141 has a reception quality detector 142, and the operation of the error detection / ARQ processor 153 of the mobile station 151 is different from that of the existing mobile station 11. / Actions of the ARQ processor 13 .

[0064] In the base station 141, the multicast signal input from the multicast signal input terminal 102 is input to the ARQ processor 103. The ARQ processor 103 divides the input multicast signal into units of slots, adds an error detection code such as CRC to it for error detection in units of slots, and sends it to the transmitter 104 . The transm...

Embodiment 1-3

[0072] Below, refer to Figure 6 Examples 1-3 of the present invention will be described. In this embodiment, a diffusion code such as an error correction code is used as a retransmission request signal.

[0073] Figure 6 It is a structural diagram of the multicast transmission system of Embodiment 1-3 of the present invention. Here, the difference from the multicast transmission system of the prior art is that the base station 161 has a reception quality detector 162, and the error detection / ARQ processor 173 of the mobile station 171 operates differently from the error detection of the existing mobile station 11. / Actions of the ARQ processor 13 .

[0074] In the base station 161, the multicast signal input from the multicast signal input terminal 102 is input to the ARQ processor 103. The ARQ processor 103 adds an error detection code such as CRC to the input multicast signal for error detection in units of packets, and then sends it to the transmitter 104 . The tran...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a multicast transmission system in which the same information is transmitted from a base station to a plurality of mobile stations, the mobile station sends a retransmission request signal to the base station when detecting an error in a received multicast signal. The base station judges whether a received signal indicates a retransmission request according to receiving quality of the received signal, and retransmits a multicast signal corresponding to the retransmission request when the received signal indicates the retransmission request. In addition, The base station monitors a receiving state of a multicast signal in the mobile stations, and changes a transmission method to conform to the receiving state according to a result of monitoring, and sends a multicast signal.

Description

[0001] This application is an invention patent application whose original application number is 01800835.6 (international application number: PCT / JP01 / 02923, application date: April 4, 2001, invention name: multicast transmission method, multicast transmission system and mobile station and base station) divisional application. technical field [0002] The present invention relates to an Automatic Repeat Request (ARQ: Automatic Repeat Request) technology that improves frame utilization and throughput during multicast signal transmission in a multicast transmission system. [0003] The present invention also relates to a technique for improving the reception quality of multicast signals in mobile stations, shortening the time required for multicast signal communication, and improving the tolerance of the entire system in the multicast transmission system. Background technique [0004] figure 1 It is the composition diagram of the existing multicast transmission system. As sh...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04L1/08H04L12/28H04B7/06H04B7/10H04L1/00H04L1/12H04L1/16H04L1/18H04L12/18H04W4/06H04W28/04
CPCH04L1/1867H04L1/1893H04L1/0001H04L1/1809H04L1/1887H04B17/0067H04L2001/0093H04L1/1692H04B7/0617H04B17/0042H04L2001/125H04L12/1863H04B17/24H04B17/309H04L1/16
Inventor 大久保信三须田博人
Owner NTT DOCOMO INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com