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Random access method for frequency division multiple address of time division orthogonal frequency

An orthogonal frequency division multiple access and random access technology, which is applied in the transmission system, data exchange through path configuration, electrical components, etc., can solve problems such as unexpected business needs and complex calculations that are not applicable to packet networks, and achieve The effect of reducing random access delay, low complexity, and increasing success probability

Active Publication Date: 2008-10-29
BEIJING STARPOINT TECH COMPANY
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Problems solved by technology

However, these algorithms are either not suitable for the frequent and sudden business needs of the packet network, or the calculation is too complicated
More importantly, network terminals send random access requests with different service priorities with the same probability. If a collision occurs, these requests will have to be backed off and resent according to the same priority level. Obviously, this will cause the system to fail to provide real-time services. Effective QoS Guarantee

Method used

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  • Random access method for frequency division multiple address of time division orthogonal frequency
  • Random access method for frequency division multiple address of time division orthogonal frequency
  • Random access method for frequency division multiple address of time division orthogonal frequency

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Embodiment Construction

[0014] Assuming that the wireless system adopts a cellular network topology, the access point AP in a certain cell serves as the central controller, and N mobile terminals MT are freely distributed in the entire cell. The air transmission delay can be ignored, and the whole system is time slot synchronous and carrier frequency synchronous. The types of services supported by the system can be divided into two categories: delay-sensitive real-time services (RT services, such as voice services and streaming services) and non-delay-sensitive non-real-time services (NRT services, such as data services). The generation of business obeys the Poisson distribution with a rate of λ per frame, that is, λ·N random access requests are generated per frame in the system on average. And the generated business is based on the probability identified as RT business, with probability Determined as NRT business, in the simulation we take The parameter value is

[0015] figure 1 A MAC fra...

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Abstract

The method includes following steps: sets priority random access channel in system; when the real-time service terminal will send random access request, selects random number M from window function [1, CWR], and occupies the number M subchannel in priority random accessing channels to send random accessing reservation code to accessing point; after receiving the feedback message of reservation code from system, the real-time service terminal occupies the corresponding subchannel in next random access channel to send random access request; when the non real-time service terminal will send random access request, selects number N from window function [1, CWN] to monitor the feedback message of system to reservation code of each subchannel in priority random access channels; calculates idle subchannel that not be reserved by random access channel of subsequence frame to find the number N idle channel in random access channels, and to occupy the subchannel to send random access request.

Description

technical field [0001] The invention relates to a random access method suitable for time division orthogonal frequency division multiple access system. Background technique [0002] In wireless digital networks, random access protocols have always been a research hotspot, especially in some systems with micro-cell structures or high peak / average traffic rates, it is especially hoped that a simple and efficient random access protocol can be adopted. Technology to meet people's needs for information access, computing and communication anytime, anywhere. Although there is no clear definition of the future mobile communication system, it is generally believed that the system is a variety of wireless access networks based on advanced technologies such as Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) and the Ipv6 core network. organic combination. Among them, OFDM can effectively overcome the influence of channel delay expansion and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/28H04L29/06
Inventor 张平田辉顾雪琳杨宁刘宝玲陶小峰安载泳
Owner BEIJING STARPOINT TECH COMPANY
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