Carrier aggregation (CA) technology-based data transmission method and device

Abstract

The invention relates to the field of communication and discloses a CA technology-based data transmission method and a CA technology-based data transmission device, which are used for ensuring the normal operation of user terminals when a plurality of cells in which the user terminals supporting CA technology aggregate have different kinds of time division duplex uplink / downlink (TDD UL / DL) configuration. In the method, a TDD UL / DL configuration set concept is introduced, an especial cell (Ecell) concept is introduced for each TDD UL / DL configuration set, each TDD UL / DL configuration set may contain one or more cells and has one Ecell which may have all or part of functions of a primary cell (Pcell), the user terminals can perform data communication with the base station through TDD UL / DLconfiguration information and the corresponding Ecells, and thus, the method can ensure the user terminals operate normally when the plurality of cells in which the user terminals aggregate have different kinds of TDD UL / DL configuration and ensure the normal operation of the system.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for data transmission based on CA technology. Background technique [0002] At present, the peak rate of the LTE-A (LTE Advanced, Long Term Evolution Enhanced) system has been greatly improved compared with the LTE system, requiring 1Gbps downlink and 500Mbps uplink. At the same time, the LTE-A system and the LTE system are required to be very compatible Therefore, the LTE-A system introduces a CA (Carrier Aggregation, Carrier Aggregation) technology based on the need to increase the peak rate, be compatible with the LTE system, and make full use of spectrum resources. [0003] CA technology means that the network side configures multiple cells (cells) for the terminal, and the terminal can work on multiple cells at the same time. A cell contains a pair of UL / DL (uplink / downlink) CC (component carrier, component carrier) or only In the DL CC, instead of the LTE syst...

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Problems solved by technology

[0022] 2. According to the regulations of the R10 version, the user terminal only reads the broadcast information on the Pcell, and the system information on other Scells is notified by dedicated signaling, but the existing dedicated signaling for notifying the Scell ​​system information does not notify the Scell ​​system information TDD UL / DL configuration is consistent with Pcell by default. Therefore, the existing R10 mechanism cannot support multiple different cells aggregated by a user terminal to use different TDD UL / DL configurations.

[0023] 3. If multiple aggregated cells are configured for the user terminal based on CA technology, and each cell uses a different TDD UL / DL configuration, then, if a cross-carrier scheduling relationship is configured between carriers corresponding to different TDD UL / DL configurations , it may lead to waste of resources

However, in the R11 version, it is stipulated that different cells aggregated by the user terminal can use different TDD UL / DL configurations. In this way, the data sent by different cells aggregated by the user terminal in the same subframe will correspond to the HARQ ACK feedback time. different, increasing the complexity of PUCCH design

[0026] For example, see figure 1 and Figure 4 As shown, the configuration number of the TDD UL / DL configuration used by Band1 is "0", and the configuration number of the TDD UL / DL configuration used by Band2 is "2", assuming that both Band1 and Band2 have A DL PDSCH transmission, but the timing of ACK feedback corresponding to the PDSCH transmission on Band1 and Band2 is different, which will increase the complexity of PUCCH design

[0027] It can be seen that the existing technology cannot actually support multiple cells aggregated by the user terminal to use different TDD UL / DL configuration sets, so a new mechanism needs to be introduced in the R11 version to ensure that the system can still normal work

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