A method, device and system for eliminating interference in random access

Abstract

The utility model discloses an interference eliminating method for the random access to the base station, which is characterized in that: choosing candidate code in order to detect the machined received ranging code signal when the ranging code is transmitted, and eliminating the ranging signal related to the selected candidate code. The utility model has the advantages that reducing the co-frequency interference in the random access in the communication system, improving the detection performance of the base station, ensuring a high service quality of the base station, and improving the experience in using. The utility model also discloses a communicator and the related system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for eliminating interference in random access. Background technique [0002] The Worldwide Interoperability for Microwave Access (WiMAX) system is a communication system based on Orthogonal Frequency Division Multiplexing (OFDM) technology. Referring to Figure 1, in the WiMAX system, the smallest unit of resource allocation is called the smallest time-frequency resource block (Slot), and a Slot consists of "M sub-channels × N symbols", where the sub-channels are frequency domain resources, A frequency band contains a set number of sub-channels, and a Slot contains M sub-channels; while a symbol is the smallest unit of time resources, a transmission time interval (TTI) contains a set number of symbols, and a Slot contains N symbols. The value of M and N depends on: 1. Whether it is uplink (Uplink, UL) or downlink (Downlink, DL); 2. Whether to use all...

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Problems solved by technology

However, the above two solutions have the following disadvantages: 1. The overhead of time-frequency resources in the system is increased, thereby increasing the system load; 2. The same-frequency interference in the system can only be reduced to a limited extent, and different When terminal stations select the same Ranging Opportunity, especially in areas where terminal stations are relatively dense, serious co-channel interference still exists in the system

In addition, due to the time delay in the WiMAX system, when a terminal station sends a Ranging code of a certain function type, it may occupy the Ranging Opportunity of another function type Ranging code, so even if the BS assigns a Ranging Opportunity to a terminal station, There will also be co-channel interference

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