Component carrier selection method, base station, terminal and communication system
A technology of component carrier and carrier, which is applied in the communication system, selects component carrier, updates component carrier, and can solve the problems of possible replacement or deletion
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no. 1 approach
[0060] In this application, the carriers that can be used by terminals and base stations in the carrier aggregation communication network are referred to as available carriers. The carrier already used by the terminal is called a component carrier, and the component carrier is also an available carrier. The component carriers of the terminal working in the carrier aggregation mode include a primary component carrier (PCC, primary component carrier) and at least one secondary component carrier (SCC, secondary component carrier).
[0061] In a carrier aggregation communication network, a base station and a terminal can use carriers located in different frequency bands for communication. For carriers with different frequency bands, the coverage of base station antennas often varies. Taking this into consideration, this application proposes to adopt different component carrier selection strategies for different coverage distribution modes.
[0062] Therefore, if figure 1 As sho...
no. 2 approach
[0093] In the first embodiment, the selection of component carriers is described for different application scenarios. In practical applications, as mentioned above, various application scenarios may be mixed. For example, the coverage of each available carrier may completely overlap (the first application scenario), or may have an inclusion relationship (the second application scenario) or partially overlap (the third application scenario).
[0094] Therefore, if Figure 8 As shown, according to an embodiment proposed in this application, selection strategies suitable for different application scenarios are successively used to select candidate component carriers, and gradually narrow down the range of candidate component carriers until the component carrier to be used is obtained. That is to say, on the basis of the first embodiment, when the coverage distribution of each available carrier includes at least two predetermined patterns, the candidate component carriers are fir...
no. 3 approach
[0099] In addition, when the terminal works in carrier aggregation mode, in addition to one primary component carrier, there are one or more secondary component carriers (SCC, Secondary Component Carrier) working at the same time, and these carriers are all in an active state. At the same time, there may still be one or more carriers in the configured but inactive state, and there may be one or more carriers in the unconfigured state.
[0100] When it is necessary to change the primary component carrier, the new primary component carrier can be selected from the secondary component carriers that are already in use, or can be selected from the available carriers that have not been configured or have been configured but not yet activated. When a second component carrier needs to be added, the new second component carrier can be selected from available carriers that have not been configured, or can be selected from available carriers that have been configured but not yet activated...
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