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ACK/NACK scheduling method and scheduling device for LTE-TDD system

A scheduling method and technology of a scheduler, applied in the LTE field of mobile communication, can solve the problem that one-to-one correspondence between uplink and downlink cannot be established.

Active Publication Date: 2009-04-01
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

However, for the TDD system, the uplink and downlink adopt a variable asymmetric structure to support asymmetric services. This asymmetric structure makes it impossible to establish a simple one-to-one correspondence between the uplink and downlink.

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  • ACK/NACK scheduling method and scheduling device for LTE-TDD system
  • ACK/NACK scheduling method and scheduling device for LTE-TDD system
  • ACK/NACK scheduling method and scheduling device for LTE-TDD system

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Embodiment Construction

[0036] The present invention proposes an ACK / NACK feedback scheme aiming at the characteristics of the TDD system, especially when there are more downlink subframes than uplink subframes, to ensure effective transmission of ACK / NACK signaling and uplink single-carrier characteristics. The so-called single-carrier characteristic here can be understood as: the channel for transmitting ACK / NACK is continuous in the frequency domain, and uses the same ZC (Zadoff-Chu) sequence.

[0037] As introduced above, for the TDD system, due to the asymmetric characteristics of the uplink and downlink, it cannot always establish a one-to-one correspondence like the FDD system. see Figure 4 , when the downlink subframe is less than or equal to the uplink subframe, the mapping relationship between the transmission ACK / NACK and the service subframe can be determined by agreement. see Figure 5 , when there are more downlink subframes than uplink subframes, it means that one uplink time slot n...

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Abstract

The invention discloses a method for scheduling ACK / NACK for an LTE-TDD system. The method comprises the following steps: a network side makes statistics on distributing condition of UE downlink service data of each user equipment, for each UE, monitoring is carried out on that whether the downlink service data is scheduled or not; after schedule of certain UE downlink service data is determined, message is transmitted to the UE to inform a channel feeding back ACK / NACK; and the UE feeds back ACK / NACK on the corresponding channel according to the received message. The invention provides an ACK / NACK feedback proposal for the LTE-TDD system to ensure effective transmission of ACK / NACK under the circumstance that downlink sub-frame is more than uplink sub-frame. Corresponding to the method, the invention also provides an ACK / NACK dispatcher for the LTE-TDD system.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 200710164202 and the X invention title "LTE-TDD System ACK / NACK Scheduling Method and Scheduler" submitted to the China Patent Office on September 30, 2007, the entire content of which is passed References are incorporated in this application. technical field [0002] The present invention relates to the technical field of LTE (Long Time Evolution, long-term evolution) of mobile communication, in particular to an LTE-TDD (Time Division Duplex, Time Division Duplex) system uplink ACK (ACKnowledge, confirmation information) / NACK (Non-ACKnowledge, Unconfirmed information) scheduling method and scheduler. Background technique [0003] The LTE system supports two frame structures. The first type of frame structure is applicable to TDD and FDD (Frequency Division Duplex, Frequency Division Duplex) systems. For this type of frame structure, see figure 1 , the frame length of ...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04L1/18H04L5/26
Inventor 肖国军索士强李国庆
Owner DATANG MOBILE COMM EQUIP CO LTD
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