Method for distributing radio resource in multiple carrier time-division duplex mobile communication system

Abstract

A method for distributing wireless resource in multicarrier time division duplexing mobile communication system, such as TD-CDMA system, to overcome the shortage of 3GPP single carrier cell channel distribution technology of covering more lager area in composing cellular system, which contains using an area of covering same or almost same as a cell, selecting one carrier as main carrier and other carriers as auxiliary carrier, the frequency of main carrier is as different as possible, setting all public control channel in main carrier, the left resource of main carrier and resource of auxiliary carrier are used in uplink and downlink service channel, the arrangement of public channel in main carrier is same with that in single carrier cell.

Description

technical field [0001] The present invention relates to mobile communication technology, more specifically to a multi-carrier time-division duplex mobile communication system, a radio resource (channel) configuration method for implementing multi-carrier operation in a cell or sector, for example, Realize the multi-carrier cell in the time division-synchronous code division multiple access TD-SCDMA system. Background technique [0002] In the current standards of the time division duplex (TDD) communication mode of the third generation mobile communication (refer to relevant technical specifications of the 3GPP), only a working mode of a single carrier is specified. The 3GPP standard TD-SCDMA system single-carrier cell channel allocation is shown in Figure 1. Taking the TD-SCDMA system with three carriers (f0, f1, f2) as an example, each carrier constitutes an independent cell, and each carrier Arrange broadcast channel (BCH) and paging channel (PCH) in its TS0 time slot, a...

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Problems solved by technology

In this way, when the spreading factor is 16, there are only 86 code channels (14+8+4×16) per carrier that can be used for uplink and downlink services, or in other words, it is only possible to support 21 two-way voice services or only Unidirectional 384kbps data service

[0006] (2) Management and control are complicated, which makes some functions less efficient

For the system, the same geographical location and the same base station are equivalent to three cells, which increases the number of cells and increases the complexity of management and control

For the important function of dynamic channel allocation (DCA) in the mobile communication system, because the execution of this function can only occupy the resources of the cell, and the resources of the cell are very limited (the spreading factor is 16, the available time slot , code channels are limited, and the total resources that can be allocated are limited), so that the dynamic channel allocation technology cannot play a role due to the lack of available resources

[0007] (3) The system will be difficult to handle random access and handover of terminals and cause measurement difficulties

At this time, since the downlink pilot signals from each cell cannot be synchronized, at each carrier frequency point, the signal-to-interference ratio may be -5 to -8dB, making it more difficult for the terminal to search for the cell , causing access difficulties; and in connection mode (communication mode), if each base station uses multiple carriers, the terminal may measure signals from dozens of different cells, and the levels of these signals are close, causing measurement difficulties

The above situation leads to a lot of erroneous switching, which makes the switching difficult and makes the system work unstable.

[0008] (4) In cellular networking, the downlink pilot (sent in DwPTS) signal of a base station with the same carrier frequency at a long distance, such as 301 and 302 in Figure 2, may interfere with the signal sent by terminal 500 after long-distance transmission Uplink pilot signal increases the difficulty of system access

For the TD-SCDMA system, one of the third generation mobile communication system standards, the current standard only supports single-carrier operation. In the multi-carrier operation mode, each carrier is only treated as an independent cell, which leads to the above four problems. obvious disadvantage

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