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Method and system for reporting channel information in time-division duplex system

A channel information, time division duplex technology, applied in time division multiplexing usage, transmission system, digital transmission system and other directions, can solve the problem of waste of signaling overhead in TDD system, and achieve the effect of saving signaling overhead

Active Publication Date: 2009-12-23
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the period and position configuration of reporting channel information in the TDD mode are less likely than in the FDD mode, the length of the required system parameters is shorter than that in the FDD mode. Therefore, Table 1 and Table 2 are used System parameters will cause waste of TDD system signaling overhead

Method used

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  • Method and system for reporting channel information in time-division duplex system
  • Method and system for reporting channel information in time-division duplex system
  • Method and system for reporting channel information in time-division duplex system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Referring to Table 4, Table 4 is a list of system parameters for reporting channel information sent by the base station to the UE when the maximum period is 40 ms in Embodiment 1 of the present invention.

[0037] parameter name

use ratio

special number

illustrate

PUCCH upper cycle

Report CQI format

1

Indicates the following two conditions:

broadband reporting

[0038] instruct

Broadband Combination Subband Reporting

PUCCH upper cycle

Report broadband

Week of CQI / PMI

Period (N p ) subframe

Offset (N OFFSET )

Location

6

Periodically report wideband CQI / PMI on PUCCH:

○N p =5ms, 10ms, 20ms, 40ms, OFF (indicating no reporting)

○N OFFSET with N p about

○The total number of possibilities: 3+6+12+24+1=46

PUCCH upper cycle

Report subband CQI

cycle (N p )

subframe offset ...

Embodiment 2

[0042] Referring to Table 5, Table 5 is a list of system parameters for reporting channel information sent by the base station to the UE when the maximum period is 160 ms in Embodiment 2 of the present invention.

[0043] parameter name

use ratio

special number

illustrate

PUCCH upper cycle

Report CQI format

instruct

1

Indicates the following two conditions:

broadband reporting

Broadband Combination Subband Reporting

Broadband on PUCCH

Periodic reporting

Week of CQI / PMI

Period (N p ) subframe

Offset (N OFFSET )

Location

8

Periodically report wideband CQI / PMI on PUCCH:

○N p =1ms, 2ms, 5ms, 10ms, 20ms, 40ms, 80ms,

160ms, OFF (means not reporting)

○N OFFSET with N p about

○The total number of possibilities: 3+6+12+24+48+96+1=190

PUCCH upper cycle

Period of reporting RI

subframe offse...

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Abstract

The invention provides a method and a system for reporting channel information in a TDD system. The method comprises the following steps: sending an RRC signaling to UE by a base station, and instructing the UE to report configuration of a periodic sub-frame offset position of the channel information in a physical uplink control channel (PUCCH); the RRC signaling comprises: periodically reporting a periodic sub-frame offset position parameter of channel quality information (CQI) of broadband or a pre-coding matrix instruction (PMI) in the PUCCH, periodically reporting a periodic sub-frame offset position parameter of CQI of sub-band or the PMI in the PUCCH, and periodically reporting a periodic sub-frame offset position parameter of a rank instruction (RI) in the PUCCH; the length of the parameter is determined by the structural configuration of a TDD frame; a mode comprises: determining the possibility number of the periodic sub-frame offset position according to the structural configuration of the TDD frame, then, determining the length of the parameter, and reporting the parameter in the PUCCH by the UE according to the configuration. The method and the system can save the signaling expense of the TDD system to allow the information exchange expense of the TDD system to be closer to that of an FDD system and improve the compatibility of two systems.

Description

technical field [0001] The invention relates to the technical field of time division duplex (TDD) systems, in particular to a method and system for reporting channel information in the TDD system. Background technique [0002] Channel information includes channel quality indicator (CQI), precoding matrix indicator (PMI) and rank indicator (RI). The base station sends high-layer signaling to the user equipment (UE), such as radio resource control (RRC) The period of reporting channel information on the uplink control channel (PUCCH) and the configuration of period subframe offset positions. The UE reports channel information on the PUCCH according to the periodic subframe offset position configuration. [0003] In the prior art, for frequency division duplex (FDD) mode, each subframe can be used to report channel information, and the reporting periods of channel information are 2ms, 5ms, 10ms, 20ms, 40ms, 80ms and 160ms. For the two different cases where the maximum period ...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04W28/18H04L5/22H04L1/00
CPCH04L1/0026
Inventor 潘学明喻晓冬肖国军丁昱索士强
Owner DATANG MOBILE COMM EQUIP CO LTD
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