Asymmetric FDD transmitting system and method

Abstract

The invention advances a transmission method with dissymmetric frequency-division duplex way and opposite communication. Wherein, the communication system covers at least one subzone; the up and down links have respectively total and unit frequency width of up and down links.; the unit frequency width of down link is larger to the up link, so number of frequency point in up link is larger than the down link. The said method comprises: constructing a up frequency pool with all up link frequency points; selecting one down link frequency point from said pool by one subzone in communication system to form frequency cluster for business transmission.

Description

technical field [0001] The present invention relates to the transmission technology of the communication system, more particularly, the present invention relates to the asymmetric frequency division duplex (AFDD) transmission technology of the communication system. Background technique [0002] In recent years, mobile communication technology has developed very rapidly. The types of mobile communication services are also becoming more and more abundant, from the initial single voice service to supporting various value-added services, such as ringtone download, news browsing, weather forecast, video on demand and so on. From a deeper level, as the main service providers - operators (such as China Mobile, China Unicom) are more concerned about how to ensure the efficient operation of an increasingly large operating network and how to efficiently use the precious resources of government licenses. frequency resources. The introduction of new technologies and systems should not...

AI Technical Summary

Problems solved by technology

In some data solutions, the idea of ​​asymmetric FDD is proposed, but the uplink and downlink are fixed one-to-one. For example, see Arturas Medeisis, European radiocommunication office, international BFWA workshop, Lillestrom, 30, CEPT Regulatory policies-BFWA in the bands , Sep-1Oct 2002, but this one-to-one correspondence method still cannot avoid the aforementioned dilemma of too few independently usable frequency points faced by 3G FDD

[0030] 3. The difference between uplink and downlink wireless transmission

[0039] There are several problems in the FDD system that is currently applied and will be applied to 3G: First, the duplex mode of symmetrical frequency use leads to low frequency reuse gain in the uplink, and the co-channel interference is serious when the uplink transmits symmetric and uplink unidirectional services. At the same time, the utilization efficiency of uplink resources is low; secondly, when the layered structure is applied, the current 3G FDD system has a phenomenon of lack of frequency points

However, there is no communication system or method that satisfies the above-mentioned asymmetric characteristics and efficiently utilizes frequency resources

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