Access method in same frequency network with N frequency points

Abstract

The invention discloses an access method in a same frequency network with N frequency points, which comprises the following steps: in each district, prearranging a large circle covered carrier wave which continuously covers a whole network and a small circle covered carrier wave which only covers a central area of the district, wherein the large circle covered carrier waves of adjacent districts are different, and each large circle covered carrier wave comprises a main carrier wave of the district; in the terminal access process, when a base station in the district where the terminal is positioned confirms that the terminal is positioned in the central area of the district, accessing the terminal into the small circle covered carrier wave of the district; and when the base station confirmsthat the terminal is positioned in a marginal area of the district, accessing the terminal into the large circle covered carrier wave of the district. By applying the access method, same frequency interference at district boundaries can be avoided.

Description

technical field [0001] The invention relates to a network access method, in particular to an access method in an N-frequency point same-frequency network. Background technique [0002] At present, the mainstream networking mode of the TD-SCDMA Low Code Rate (LCR) system is N-frequency co-frequency networking, that is, each cell uses the same N frequency points, and selects one frequency point from the N frequency points as the The main carrier, and the remaining frequency points are used as auxiliary carriers, and the main carriers of adjacent cells are different from each other. In the same cell, the downlink synchronization signal (DwPTS), broadcast information and related common channels are only sent on the main carrier. [0003] Compared with the single-frequency point scheme, the N-frequency point scheme changes the inter-cell interference of the public channel from co-frequency interference to inter-frequency interference, which greatly improves the robustness of the...

AI Technical Summary

Problems solved by technology

However, the N-frequency scheme does not consider how to reduce the interference of traffic channels

Especially during the access process, all carriers achieve continuous coverage of the entire network, such as figure 1 As shown, although the primary carriers of cell 1 and cell 2 are different, the secondary carrier of cell 1 may be the same as the primary carrier or secondary carrier of cell 2. At this time, for users at the cell border, co-channel interference will occur

At the same time, because the initial transmit power in the open-loop power control algorithm is usually relatively high, transmitting with a large power at the cell boundary will cause serious co-channel interference

[0004] Severe co-channel interference is unavoidable in an N-frequency co-frequency network, and it is the main risk of N-frequency co-frequency networking, which is unacceptable to both operators and users, so further Reduce or even isolate co-channel interference

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