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Method for sending signalings on downlink control channel

A technology of a control channel and a sending method, applied in the field of signaling transmission, can solve problems such as waste of resources, and achieve the effect of saving system resources

Active Publication Date: 2009-12-16
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the existing PDCCH format, there is no dedicated format for BF
If the existing transmission format is used, for example, the DCI format2 shown in Table 2 is used, the information of precoding and matrix is ​​included in the transmitted signaling, resulting in waste of resources

Method used

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  • Method for sending signalings on downlink control channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The flow of the signaling sending method in this embodiment is as follows:

[0047] Step 21, preset the dedicated DCI format of the BF transmission mode.

[0048] In this embodiment, the precoding matrix sequence number field and the precoding acknowledgment indication field are directly deleted on the basis of the existing DCI format 2, so as to form a dedicated DCI format for the BF transmission mode, as shown in Table 3.

[0049] field

Bits

comment

Resource allocation header

1

Indicates that the allocation type is type 0 or 1

RB allocation

25

PRB resource allocation indication

TPC

2

Power control command of PUCCH

Number of layers

2

BF layers: 1, 2, 3, 4

Hybrid ARQ process number

3 / 4

Number of HARQ processes: 3 for FDD, max 4 for TDD

MCS, first transport block

5

Transmission modulation coding format of data block 1

New data indicator(1st TB)

...

Embodiment 2

[0057] The flow of the signaling sending method in this embodiment is as follows:

[0058] Step 31, preset the dedicated DCI format of the BF transmission mode.

[0059] For multi-stream BF, the base station uses an 8-antenna array and supports a transmission mode with more than 2 beams (beams). The correlation between beams will be very high, resulting in performance degradation. Generally speaking, supporting 2 beams is a better choice. Therefore, the specific number of BF layers may be 1 or 2. In this way, the indication bit of the BF layer number field in the DCI format shown in Table 3 can be further reduced to 1 bit.

[0060] In addition, the DCI format shown in Table 3 includes parameters related to the two data blocks used in transmission, which are the transmission modulation and coding format (MCS) field of data block 1, the inversion indication of data block 1, and the redundancy The remaining version field, the MCS field of data block 2, the rollover indication o...

Embodiment 3

[0068] Step 41, preset the dedicated DCI format of the BF transmission mode.

[0069] The DCI format 2 format includes fields indicating resource allocation, specifically the resource allocation header (Resource allocation header) field and the PRB resource allocation indication (RB allocation) field, where the Resource allocation header field indicates the resource allocation method, and the RB allocation field indicates Resource information specifically allocated in a specific resource allocation mode. Currently, LTE scheduling supports three methods: type0, type1, and type2. Resource allocation in type0 and type1 can be arbitrary. Therefore, corresponding to these two resource allocation methods, each RB allocated needs to be indicated in the RB allocation field. The block information occupies more bits; while the type2 method is a continuous resource allocation method. Corresponding to this resource allocation method, the RB allocation field only needs to indicate the star...

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Abstract

The invention discloses a method for sending signalings on a downlink control channel. The method comprises the following steps: when downlink dispatching is carried out in a multithread beam-shaping BF (Band Filter) transmission mode, a substation on the physical downlink control channel (PDCCH) organizes and sends signalings in a special downlink control information (DCI) format of the preset BF transmission mode. The invention can be used to save system sources in the multithread BF transmission mode.

Description

technical field [0001] The invention relates to a signaling transmission technology in a mobile communication system, in particular to a signaling sending method on a downlink control channel (PDCCH). Background technique [0002] In the LTE system, the downlink control channel is PDCCH, which is used to carry downlink control information (DCI) such as downlink scheduling signaling, uplink scheduling signaling, and power control signaling to indicate uplink and downlink resource allocation and power control. At present, the LTE standard has determined PDCCHs of multiple DCI formats, and the number of information bits of each format is different, and the specific signaling information included is also different. [0003] When performing signaling transmission on the PDCCH, one of the existing DCI formats is first selected according to the application scenario, and then the signaling is organized in the selected DCI format and sent to the user terminal (UE). [0004] Currentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/12H04B7/06
CPCH04W72/00
Inventor 肖国军索士强丁昱
Owner DATANG MOBILE COMM EQUIP CO LTD
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