A method for realizing downlink control information with optimized uplink harq

Abstract

The invention discloses a method for realizing downlink control information of optimized uplink HARQ, comprising the following steps: setting at least two independent information elements in the downlink control information, and the data type of each information element is a bit map; wherein, the first information The number of bits in the cell is the number of uplink component carriers scheduled by the user equipment, and the order of the bits indicates the index of the component carriers; the number of bits in the second cell is the transmission sent on all uplink component carriers that the user equipment is scheduled The number of blocks; each component carrier corresponds to at least one and at most two transport blocks, and the sequence of bits indicates the index of the transport blocks. Compared with the prior art, the present invention can effectively solve PHICH collision, improve the feedback efficiency of UL HARQ ACK / NACK and the blind detection efficiency of downlink control information.

Description

technical field [0001] The invention relates to a method for realizing downlink control information for optimizing an uplink hybrid automatic repeat request (UL HARQ), and belongs to the technical field of wireless communication. Background technique [0002] Currently, the fourth-generation cellular mobile communication system (IMT-advanced) has become one of the mainstream mobile communication technologies. In the cellular mobile communication system, methods such as Forward Error Correction (FEC) coding technology and Automatic Repeat Request (ARQ) are usually used for error control, so as to ensure the quality of service. In the prior art, ARQ and FEC are mostly used in combination, which is the so-called hybrid automatic repeat request (HARQ) mechanism. In the HARQ mechanism, FEC is used to reduce the number of retransmissions and the bit error rate, and ARQ retransmission and CRC check are used to ensure the quality of packet data transmission. With the rapid develop...

AI Technical Summary

Problems solved by technology

[0010] 1) PHICH is only supported in the control domain and cannot be extended to the data domain, so the resource of PHICH is a bottleneck;

[0011] 2) A single user equipment needs to occupy multiple PHICH groups, and the number of PHICH groups is a system configuration value, which is related to the bandwidth of the carrier and is relatively valuable;

[0012] 3) As the number of component carriers increases, the collision probability of PHICH resources will increase sharply

[0014] 1) Only when the user equipment has uplink scheduling requirements (new data or adaptive retransmission), this implicit HARQ feedback method can be used; and for the case of new data, the ACK of the last uplink data cannot be guaranteed / NACK meets the requirements of HARQ time;

[0015] 2) DCI 0 / 4 itself is to achieve uplink authorization, and its implicit HARQ feedback indication function is only a by-product, so it is not practical to ask it to do too many non-job requirements

[0016] In the existing technology, when the user equipment receives the ACK expressed in PHICH mode, it does not know whether the ACK is "true or not", it depends on whether there is uplink authorization information corresponding to the HARQ processing process in the same transmission time interval or subsequent transmission time intervals / downlink control information for further confirmation, so sometimes it will cause the user equipment to do some unnecessary blind detection

Images