| 摘要 |
<p>When a terminal apparatus (102) is communicating with a base station apparatus (100) by single base station communication, that base station apparatus (100) transmits base station specific reference signals (L101). The terminal apparatus (102) determines the received power of the direct reference signals from the received reference signals (S102). The base station apparatus (100) transmits, to the terminal apparatus, power setting parameters ?A and ?B at the time of single base station communication (L102). The terminal apparatus can determine the power for type A and type B data based on the power of the reference signals from earlier and the received ?A and ?B (S103), and demodulate then receive data (S104). When the terminal apparatus is communicating by coordinated multipoint communication (CoMP), the terminal apparatus will also receive signals from a base station apparatus (101) used in CoMP. As stated earlier, base station apparatuses constantly transmit base station specific reference signals (L103). The terminal apparatus receives the base station specific reference signals from this base station apparatus (referred to here as the coordinated multipoint base station) (101), also receives the base station specific reference signals from the conventional base station apparatus (referred to here as the main base station) (L104), and determines the power of the respective reference signals (S109). The base station apparatuses (100, 101) carrying out CoMP adjust the used parameters and scheduling between each other (L105), and determine their respective CoMP parameters (S108, S107). At the time of CoMP, the same values for the parameters for CoMP are set for both base station apparatuses, and are notified to the terminal apparatus (L106). This notification is sent per terminal, and in the case of terminal apparatuses which do not perform CoMP but are under the same base station apparatus, a parameter ?B for use in the conventional single base station communication mode can be sent, while in the case of base station apparatuses performing CoMP, a parameter ?B for use in CoMP can be sent. The terminal apparatus can calculate the type A and type B power based on the power of the received ?A, ?B and the earlier reference signals (S110), and can perform CoMP reception (S111). Due to this, when carrying out coordinated multipoint communication, the terminal apparatus can correctly determine the power for the data at the time of coordinated multipoint communication in cases when the ratios of the power for the data at the transmission symbols containing the reference signals to the power for the data at the transmission symbols not containing the reference signals are different values between the base stations carrying out coordinated multipoint communication.</p> |
