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Method and device for quickly receiving and sending downlink data and uplink data

A kind of downlink data, fast technology, applied in the direction of digital transmission system, access restriction, modulated carrier system, etc., to achieve the effect of improving system performance, speeding up uplink synchronization process, and reducing conversion time

Inactive Publication Date: 2015-07-15
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after the cell switches to the ON state, it is still possible to continue sending DiS

Method used

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  • Method and device for quickly receiving and sending downlink data and uplink data
  • Method and device for quickly receiving and sending downlink data and uplink data
  • Method and device for quickly receiving and sending downlink data and uplink data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This embodiment introduces a preferred implementation method for accelerating the UE uplink synchronization process.

[0071] In order to transmit uplink control signals and uplink data in cell X, the UE first needs to complete uplink synchronization with cell X. In the existing CA mechanism, assuming that the Scell ​​and the Pcell belong to different timing advance groups (TAG), it is necessary to trigger the random access process of the UE on this Scell ​​to obtain uplink synchronization. Assuming that the UE receives the instruction to activate this Scell ​​in subframe n, the UE starts to detect the PDCCH order that triggers the random access process of this Scell ​​from subframe n+t0; then, the UE is at least in subframe n+t0+ k2 can send a random access preamble signal (Preamble), where k2 is greater than or equal to 6, and PRACH resources are allocated on subframe n+t0+k2; then, the UE can obtain uplink synchronization after receiving the random access response infor...

Embodiment 2

[0087] In this embodiment, a preferred implementation manner for measuring RSRP / RSRQ and CSI information according to DiS is given.

[0088] In order to effectively transmit downlink control signals and downlink data in cell X, downlink CSI information is a necessary condition. In the existing LTE CA mechanism, assuming that the UE receives the indication information for activating one Scell ​​in subframe n, the UE starts to feed back CSI information from subframe n+t0. For example, in the LTE CA system, t0 is equal to 8. In fact, the feedback of CSI information also depends on other factors, such as whether the uplink is currently synchronized, whether periodic CSI feedback channel resources are available, and the delay for triggering aperiodic CSI reports and receiving UE CSI from cell X It is reported that the CSI can be used to report the time delay of scheduling the UE's downlink data. In this way, according to the existing LTE CA mechanism, generally speaking, there is no...

Embodiment 3

[0108] This embodiment provides a preferred implementation manner for accelerating measurement and reporting accurate CSI information to cell X.

[0109] In order to effectively transmit downlink control signals and downlink data in cell X, downlink CSI information is a necessary condition. In the existing LTE CA mechanism, assuming that the UE receives the indication information for activating one Scell ​​in subframe n, the UE starts to feed back CSI information from subframe n+t0. For example, in the LTE CA system, t0 is equal to 8. In fact, the feedback of CSI information also depends on other factors, such as whether the uplink is currently synchronized, whether there are available periodic CQI feedback channel resources, and the delay for triggering aperiodic CSI reports and receiving the UE’s CSI from cell X It is reported that the CSI can be used to report the time delay of scheduling the UE's downlink data. In this way, according to the existing LTE CA mechanism, genera...

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Abstract

A method for fast receiving and transmitting Downlink (DL) and Uplink (UL) data includes: processing, by a User Equipment (UE), DL synchronization according to a Discovery Signal (DiS), or according to the DiS and a Cell-specific Reference Signal (CRS) after a cell X is opened; measuring, by the UE, Reference Signal Receiving Power (RSRP) / Reference Signal Receiving Quality (RSRQ) and / or Channel State Information (CSI) information of the cell X based on the DiS and reporting the RSRP / RSRQ and / or CSI information to a serving cell, which is currently working; receiving, by the UE, a Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH) on the cell X, detecting trigger information of a random access process on the cell X, executing the random access process, measuring and reporting, by the UE, the CSI information to the cell X. With the method and terminal device in the present disclosure, a UL synchronization process of the UE and a process for the UE to measure and feed back the CSI may be speeded up, the transition from the opening of the cell to a moment that the UL and DL data of the UE may be actually received and transmitted may be reduced, the ON / OFF operation of the cell may be effectively supported and the performance of the system may be enhanced.

Description

Technical field [0001] The present invention relates to a wireless communication system, and more specifically to a method and equipment for quickly opening a serving cell and sending and receiving downlink data and uplink data. Background technique [0002] In the 3GPP LTE system, the length of each radio frame is 10 ms, which is equally divided into 10 subframes. A downlink transmission time interval (TTI) is defined on a subframe. Such as figure 1 Shown is a schematic diagram of the subframe structure. Each downlink subframe includes two time slots. For the general cyclic prefix (CP) length, each time slot contains 7 OFDM symbols; for the extended CP length, each time slot contains 6 OFDM symbols. The granularity of resource allocation in a subframe is the physical resource block PRB. A PRB contains 12 consecutive sub-carriers in frequency and corresponds to a time slot in time. Two PRBs in two time slots on the same subcarrier in a subframe are called a PRB pair. In each...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/04H04W48/12
CPCH04W24/04H04W48/12H04W74/0833H04L5/0048H04L5/0053H04L27/2655H04L5/0078
Inventor 李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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