Communication method and communication device for downlink control information

A technology for control information and physical downlink control, applied in the field of LTE and NR mobile communication networks, and can solve problems such as low information transmission efficiency

Inactive Publication Date: 2017-10-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problem caused by using PDCCH to send public resource allocation information to terminals supporting short TTI and the problem of relatively low transmission efficiency of existing LTE network system information, the present invention provides a communication method and device for downlink control information, including short TTI support The TTI terminal sends updated relevant public radio resource configuration information supporting short TTI communication
For the problem that the system information transmission efficiency of the existing LTE network is relatively low, after the terminal obtains the system information necessary for initial access and accesses the network, the base station configures the system information for specific services to the terminal through RRC dedicated signaling. When a group of terminals of a specific service update system information, different groups of RNTIs are used to scramble the physical downlink control channel and physical downlink data channel, so that only terminals supporting this type of service receive the corresponding system information update

Method used

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  • Communication method and communication device for downlink control information
  • Communication method and communication device for downlink control information
  • Communication method and communication device for downlink control information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] As shown in Table 3, according to the current situation of supporting short TTI terminal access, when multiple sets of PRB pairs need to be used, the positions of multiple sets of PRB pairs need to be sent in the PDCCH, and when both uplink and downlink need to configure multiple sets of PRB For example, four sets of PRB pairs are used for channel allocation of the downlink sPDSCH channel and uplink sPUSCH channel. At this time, it is not appropriate to use the PDCCH channel to configure related public resources. Therefore, a new RRC message is introduced to send these public radio resource configuration information. This new RRC message is sent on the PDSCH channel, and is scrambled with a scrambling code different from SI-RNTI, such as STTI-RNTI shown in Table 3. STTI-RNTI is a group RNTI that supports short TTI for a group shared terminal.

[0162] table 3

[0163]

Embodiment 2

[0165] When a D2D-supporting terminal accesses the base station, the base station determines whether to send updated system information for D2D communication to a group of D2D-supporting terminals using D2D-RNTI scrambled physical downlink data channels. When there is no D2D terminal access in a cell under a base station supporting D2D, the base station does not need to send system information for D2D communication of the D2D terminal. Or when all the terminals supporting D2D communication in the cell have released the wireless link, the base station does not need to send system information for D2D communication to the D2D terminals in the cell. As the D2D-RNTI shown in Table 4, the D2D-RNTI is a group RNTI shared by a group of terminals supporting D2D communication.

[0166]

Embodiment 3

[0168] Image 6 A schematic diagram of sending a PDCCH and PDSCH scrambled by an STTI-RNTI scrambled by a terminal supporting a short TTI is given in a specific subframe. Image 6 The discontinuous reception period of the middle terminal is 10 subframes, and 3 subframes need to detect whether there is an STTI-RNTI scrambled PDCCH control channel, and the offset of the start subframe within a system frame is 0. In subframes k, k+1 and k+2, the terminal needs to detect whether the base station uses the STTI-RNTI to scramble the PDCCH and PDSCH in these subframes, and sends public radio resource configuration information. Similarly, in subframes k+10, k+11, k+12, k+20, k+21, k+22 and k+30, k+31, k+32 terminals also need to do related detection, as shown in Fig. For other positions given in , the terminal does not need to detect whether there is a PDCCH control channel scrambled by STTI-RNTI, which is used to reduce power consumption. Image 6 There are 3 subframes in each disco...

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Abstract

The invention provides a communication method and a communication device for the downlink control information, and relates to the field of LTE and NR mobile communication networks. The communication method comprises the steps of scrambling the cyclic redundancy code (CRC) part of a physical downlink control channel and a physical downlink data channel by adopting a predetermined wireless network temporary identifier (RNTI), wherein the scrambled physical downlink data channel carries the system information for enabling a terminal to conduct a specific service; and sending the scrambled physical downlink control channel and the scrambled physical downlink data channel to a set of terminals for conducting the specific service. In this way, the waste of the wireless resources and the energy consumption of a base station are reduced. The information sending efficiency of the system is improved.

Description

technical field [0001] The present invention relates to the field of LTE (Long Term Evolution, Long Term Evolution) and NR (New Radio, New Radio Interface) mobile communication networks, in particular to a communication method and device for downlink control information. Background technique [0002] The LTE mobile communication network has been using 1 ms subframes for data transmission since the 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project) was established for research. With the emergence of new applications with higher requirements on delay, such as virtual reality and real-time cloud computing, new requirements are also put forward for LTE networks, such as reducing air interface transmission delay. Therefore, it is necessary to establish a research project for air interface transmission. In the 3GPP RAN#67 meeting, a research item on reducing air interface transmission delay was passed. In this research item, it is pointed out that it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W76/04
CPCH04W72/0466H04W72/0446H04W72/23Y02D30/70
Inventor 陈冬雷夏树强游爱民戴谦
Owner ZTE CORP
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