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Asymmetric FDD transmitting system and method

A technology of frequency division duplexing and transmission methods, which is applied in network planning, electrical components, radio/inductive link selection and arrangement, etc., and can solve the shortage of frequency points, low efficiency of uplink resource usage, and low frequency multiplexing gain in 3GFDD systems, etc. problem, to achieve the effect of improving the overall transmission efficiency, improving the overall transmission capacity, and improving the flexibility of the system

Inactive Publication Date: 2006-04-05
BEIJING UNIV OF POSTS & TELECOMM
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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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  • Asymmetric FDD transmitting system and method
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  • Asymmetric FDD transmitting system and method

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Embodiment Construction

[0069] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0070] First, Fig. 1 shows a schematic diagram of frequency allocation of AFDD according to the present invention. It can be seen from Figure 1 that the uplink and downlink of AFDD occupy a non-overlapping frequency segment 110 and 120 respectively, and there is an interval bandwidth similar to that of FDD between the two frequency segments, that is, the duplex in Figure 1 The distance (duplex distance) is 130. And according to the present invention, it is required that the independently usable unit bandwidth 120-1 of the downlink 120 is greater than the independently usable unit bandwidth 110-1 of the uplink 110, so that the number of independently usable frequency points of the uplink will be more than The number of frequency points that can be used independently in the downlink to meet the asymmetric characteristics of the uplink and downlink.

[00...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/20H04W16/10H04W72/04
Inventor 王卫东张英海姜春霞李晓东
Owner BEIJING UNIV OF POSTS & TELECOMM
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