In a radio device, an automatic repeat request circuit communicates data messages to remote radio devices at selected data rates. Responses to the data messages are collected and statistics developed about success rates of the data messages at the selected data rates. A current data rate is selected based on the statistics and a packet is transmitted. The data rate can be adapted using the statistics about success rates of the data messages.

Rate adaption algorithm for a wireless connection

The invention discloses a method for guaranteeing the end-to-end QoS in an SDN network, comprising the following steps: (1) for each new data flow arriving at an SDN network, an SDN network controller periodically collects network status information; (2) the SDN network controller calculates the cost of each of all alternative paths for transmitting the new data flow according to the collected network status information, and determines an optimal transmission path; and (3) the SDN network controller packages the information of the optimal transmission path into a flow entry and issues the flow entry to a switch node of the SDN network, and the switch node forwards a received data packet according to the flow entry. According to the invention, an OpenFlow switch queue mechanism is designed, and the queue status of the switch is monitored in real time through the controller. When a new data flow arrives, a minimum-cost path is selected to transmit the data flow according to the transmission delay of the link on the path and the queuing delay of the switch node queue as well as the congestion situation of the current link.

Method for guaranteeing end-to-end QoS in SDN network

The invention discloses a multi-cell space interference aligning implementing method based on limited rate pre-coding feedback, and belongs to the wireless communication technology According to the method, smaller feedback overland is used for achieving space interference aligning under the multi-cell same-frequency networking condition, and therefore the system throughput rate is improved According to the method, transmitted pre-coding matrixes serve as feedback objects of limited rate feedback links, so that the feedback overland of the feedback links between a base station and a mobile terminal is reduced Meanwhile, interference aligning is achieved only through spatial dimensions provided by multiple MIMO antennas between the mobile terminal and the base station so that the channel multiplexing gain maximization can be achieved According to changes of the number of the antennas of the mobile terminals, the number of data streams and the transmitting total power, the feedback rate of the transmitting pre-coding feedback links is adjusted, it can be guaranteed that space interference aligning multiplexing gains under the ideal and overall channel state information are achieved with the small feedback overland as many as possible, the space channel utilization rate is accordingly improved, and the system performance is improved

Multi-cell space interference aligning implementing method based on limited rate pre-coding feedback

The invention relates to a link self-adaption method and device, access network equipment and a storage medium. The link self-adaption method comprises the following steps: confirming a first candidate MCS according to a target bit error rate; and traversing the target MCSs of which the index values are greater than the first candidate MCSs, obtaining the transmission error rate of each target MCS, and confirming the target MCSs of which the transmission error rates are in the error rate range as second candidate MCSs; and acquiring transmission parameters corresponding to the candidate MCSs,and confirming the MCSs of the links from the candidate MCSs based on the system performance index requirements and the transmission parameters. Based on this, the selection of the link MCS is not limited by the target bit error rate, and the system throughput and user perception can be improved. Meanwhile, according to system performance index requirements, system throughput and time delay corresponding to different MCSs are combined, the MCSs meeting the requirements are selected within a certain range exceeding the target bit error rate, the system throughput and the time delay can be considered, and the system link performance can be optimal.

Link self-adaption method and device, access network equipment and storage medium

The invention discloses a multi-cell beam forming method and a multi-cell beam forming device. The method comprises steps: with a principle of maximizing the signal intensity of a cooperative cell scheduling user and minimizing weighted interference leakage on other cooperative cell scheduling users by the cooperative cell scheduling user, a beam forming vector bq for each cooperative cell in a heterogeneous network is calculated; and based on the calculation result, a beam forming vector bq for the corresponding cooperative cell is updated to enable each cooperative cell to transmit data according to the updated beam forming vector bq and the corresponding scheduling user. The method of the invention is used for calculating and acquiring the beam forming vector for data transmission, the best balance between the system performance and the interference avoidance is achieved, effectiveness of interference management is improved, and the system capacity of a low-power node is further improved.

Multi-cell beam forming method and multi-cell beam forming device

The invention relates to a link adapting method based on an AMC-ARQ (Adaptive Modulation and Coding-Automatic Repeat-reQuest) striding layer. The link adapting method comprises the step of designing a mapping relation of a receiving SNR (Signal to Noise Ratio) of a physical layer and MCS (Modulation Coding Scheme) by utilizing a QoS (Quality of Service) demand of a data link layer and the information of the physical layer according to a target packet error rate of the physical layer. According to an ergodic method, the optimal packet error rate of the physical layer, the maximum retransmission times of the ARQ of the data link layer and the size combination of a rearranging timer of the data link layer are searched, so that the use ratio of effective frequency spectrum is maximal. According to the link adapting method provided by the invention, the physical layer and the data link layer are comprehensively considered; the correlation influence of the parameters between the two layers is fully utilized to obtain AMC and ARQ parameters; the optimal parameter combination for maximizing the efficiency of the effective frequency spectrum is obtained; and the time delay is calculated by dividing the time delay into two parts of a queuing time delay and a transmission time delay, so that the calculation for the time delay is more accurate. According to the link adapting method provided by the invention, the selection for a modulation coding mode is relative to a channel condition and transmission times, and the redundant information transmitted at each time is fully utilized.

Link adapting method based on AMC-ARQ (Adaptive Modulation and Coding-Automatic Repeat-reQuest) striding layer

The invention relates to a multiple cell interference alignment iterative algorithm based on beam forming, which includes the following steps: step 1, building an initializing emission matrix of all base stations; step 2, calculating the total interference from other cells based on all users from each cell; step 3, finding out a receiving matrix of each user as per the total interference outside other cells and received by each user, and selecting the characteristic value vector corresponding to d maximum characteristic values in the total interference as the receiving vector of the user, wherein d is the number of data flows received by each user; step 4, calculating the corresponding sending vector of each user as per the known receiving matrix and a design principle of an MMSE receiver; step 5, judging whether convergence exists in the algorithm for the sending vector or not, and returning to step 2 if no convergence exists, and going the iteration on, and stepping out the iteration and performing the next step, step 6, if the convergence exists; and step 6, calculating a useful signal P and an interference signal I received by each user. According to the invention, under the multi-cell condition, the interference among cells and interference outside the cells are aligned to a subspace orthogonal to the useful signal, and the system throughput is improved effectively.

Multiple cell interference alignment iterative algorithm based on beam forming

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Li Wei

Author Tools

Chat about Author

Papers

Link adapting method based on AMC-ARQ (Adaptive Modulation and Coding-Automatic Repeat-reQuest) striding layer

Multiple cell interference alignment iterative algorithm based on beam forming